Filters: Tags: {"type":"Harvest Set"} (X) > Types: Shapefile (X) > Types: Downloadable (X)

Filters Date Range Past year (302) Past month (26) Past week (4) Past day (0) Custom range... To   Search Extensions Shapefile (1108) ArcGIS Service Definition (18) Budget (14) Project (14) Raster (14) More... Types Map Service (1128) OGC WFS Layer (1127) OGC WMS Layer (1127) OGC WMS Service (126) Citation (69) More... Contacts U.S. Geological Survey - CERSC Data Management Services Project Energy and Minerals Central Energy Resources Science Center U.S. Geological Survey - ScienceBase U.S. Geological Survey - ScienceBase More... Categories Data (1127) pre-SM502.8 (438) Data Release - Revised (23) Project (14) Data Release - In Progress (5) More... Tags (with Type=Harvest Set ) usgs science data catalog (sdc) (988) lcc network science catalog (141) data.gov great northern landscape conservation cooperative (46) data.gov desert landscape conservation cooperative (13) data.gov desert lcc (9) data.gov great plains lcc (5) data.gov landscape conservation cooperative network (4) More... View Results as: JSON ATOM CSV

Zebra Mussel Mortality - Assessment of uncontained Zequanox applications in a Midwestern lake data We applied Zequanox using a custom-engineered, boat mounted application system to replicated 0.30 Hectare plots within a small inland lake. The objectives of these applications were to determine if uncontained, open-water Zequanox applications could effectively control zebra mussel populations and protect native unionid mussel populations within zebra mussel infested systems. The datasets included are as follows: Exposure Water Chemistry Hardness and Alkalinity Native Mussel Sonde Water Chemistry Zebra Mussel Density Zebra Mussel Length Zebra Mussel Mortality Zequanox Concentration ShapeFiles: PLOTS, UNIONID, ZEQUANOX CONCENTRATION, ZM_DENSITY, ZM_MORTALITY Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Round Lake, Emmet County, Michigan, USA, USGS Science Data Catalog (SDC), Zebra Mussel, Zequanox Lake Ontario Nearshore Nutrient Study (LONNS), 2018, Lake Ontario, New York From April through September of 2018, water-quality data were collected at 35 locations from select tributaries, embayments, and nearshore lake locations along New York's portion of Lake Ontario in support of the 2018 Cooperative Science and Monitoring Initiative, the Great Lakes Restoration Initiative, and the Lakewide Action Management Plan. These data include environmental, replicate, and blank samples of nutrients, suspended solids, sodium, and chloride, as well as field measurements of physical parameters (temperature, specific conductance, dissolved oxygen, pH, turbidity, phycocyanin relative fluorescence, chlorophyll relative fluorescence, photosynthetically active radiation, and phycocyanin:cholorphyll... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Cayuga County, Hydrology, Jefferson County, Lake Ontario, Monroe County, All tags... Nearshore Environmental Health, New York, Niagara County, Orleans County, Oswego County, Surface-Water Quality Monitoring, USGS Science Data Catalog (SDC), United States, Water Quality, Water Quality, Water Quality, Wayne County, nutrients, water quality, Fewer tags Climatological data for the Loch Vale watershed in Rocky Mountain National Park, Colorado, water years 1992-2019 This data release contains hourly means of climatological data collected by the U.S. Geological Survey (USGS) from 10/1/1991 to 9/30/2019 at three weather stations in the Loch Vale watershed in Rocky Mountain National Park (RMNP), Colorado. In order of increasing elevation, the three weather stations are Loch Vale meteorological station at RMNP, Colo. (Main weather station, USGS station 401719105394311) at an elevation of 2,925 meters (m) above North American Vertical Datum of 1988 (NAVD 88), Andrews Creek meteorological station at RMNP, Colo. (Andrews Creek weather station, USGS station 401723105400101) at an elevation of 2,990 m above NAVD 88 and Sharkstooth meteorological station at RMNP, Colo. (Sharkstooth weather... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: 177847, Climatology, Hydrology, Rocky Mountain National Park, The Loch, All tags... USGS Science Data Catalog (SDC), Water Quality, climatology, field monitoring stations, real-time monitoring and reporting, Fewer tags USGS Denver Micro-fossil collection: Fossil Algae The Denver fossil algae database were gathered from the inception of Denver Region in 1953 by Richard Rezak. His specialty was algae, carbonate platforms, and off-shore modern reefs. He developed a very useful litho-stratigraphic tool while studying Proterozoic algae and stromatolites in Glacier National Park. This lead to his studies of modern analogs in the Caribbean and South Seas. His catalogs were converted into digital form, Excel and Filemaker Pro database. The Catalog consist of 1001 fossil localities. His supplementary data has been added whenever possible - sources field map locality points, E&R files with enhanced faunal lists, as well as formal publications Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Eastern Asia, USGS Science Data Catalog (SDC), United States, algae, biota, All tags... fossils, litho-stratigraphy, none, stromatolites, Fewer tags Fishway Structure Data in the Eastern United States These data are a compilation of fishway structures collected by the Atlantic States Marine Fisheries Commission state representatives at the request of the U.S. Geological Survey. The variables included within this dataset range from locality information and structure metadata (eg. latitude/longitude and year of construction) to metrics specifically about the fishway structure (eg. fishway width). The dataset ranges in dates of construction from 1882 to 2020 and includes fishways from all states on the eastern coast of the United States. Requests were sent to the Atlantic States Marine Fisheries Commission state representatives to collect fishway data from the areas within their responsibility. The state representatives... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Aquatic Biology, Ecology, Ecology, USGS Science Data Catalog (SDC) USGS National and Global Oil and Gas Assessment Project—Mesozoic Petroleum Systems of Central European Basin System: Assessment Unit Boundaries, Assessment Input Data, and Fact Sheet Data Tables This data release contains the boundaries of assessment units, assessment input data and resulting fact sheet data tables for the assessment of undiscovered oil and gas resources in the Mesozoic petroleum systems of the Central European Basin System. The Assessment Unit is the fundamental unit used in the National and Global Oil and Gas Assessment Project for the assessment of undiscovered oil and gas resources. The Assessment Unit is defined within the context of the higher-level Total Petroleum System. The Assessment Unit is shown herein as a geographic boundary interpreted, defined, and mapped by the geologist responsible for the province and incorporates a set of known or postulated oil and (or) gas accumulations... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Assessment Unit, Central-Tail End Graben Conventional Oil and Gas, Conventional Assessment Unit, East Shetland Platform Conventional Oil, Energy Resources, All tags... Energy Resources, Faeroes-Shetland-Orkney Basin Conventional Oil and Gas, Geology, Germany, Lower Saxony Basin Mesozoic Conventional Oil and Gas, Moray Firth Basin-Witch Ground Graben Conventional Oil and Gas, NOGA2000, National Assessment of Oil and Gas, Natural Gas, Netherlands, Oil, OilGas, Resource Assessment, USGS Science Data Catalog (SDC), United Kingdom, Utsira High-Horda Platform Conventional Oil and Gas, Viking Graben-East Shetland Basin Conventional Oil and Gas, West Netherlands Basin Mesozoic Conventional Oil and Gas, energy resources, geoscientificInformation, natural gas resources, oil resources, petroleum, Fewer tags Estimated low-flow statistics at ungaged stream locations in New Jersey, water year 2017 Estimates of various low-flow statistics were computed at 71 ungaged stream locations throughout New Jersey during the 2017 water year using methods in the published reports, Streamflow Characteristics and Trends in New Jersey, Water Years 1897-2003 (U.S. Geological Survey Scientific Investigations Report 2005-5105) and Implementation of MOVE.1, Censored MOVE.1, and Piecewise MOVE.1 Low-Flow Regressions With Applications at Partial-Record Streamgages in New Jersey (U.S. Geological Survey Open File Report 2018-1089). The estimates are computed as needed for use in water resources permitting, assessment, and management by the New Jersey Department of Environmental Protection. The data release includes the stream name,... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: Estimation, Low-flow statistics, New Jersey, USGS Science Data Catalog (SDC), Water Resources Estimated low-flow statistics at ungaged stream locations in New Jersey, water year 2016 Estimates of various low-flow statistics were computed at 61 ungaged stream locations throughout New Jersey during the 2016 water year using methods in the report, Streamflow Characteristics and Trends in New Jersey, Water Years 1897-2003 (U.S. Geological Survey Scientific Investigations Report 2005-5105). The estimates are computed as needed for use in water resources permitting, assessment, and management by the New Jersey Department of Environmental Protection. The data release includes the stream name, location, method, and intended use of the low-flow statistics computed during the 2016 water year. The data are provided as both a plain text file and an ArcGIS shapfile format. Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: Estimation, Low-flow statistics, New Jersey, USGS Science Data Catalog (SDC), Water Resources NorWeST Predicted Stream Temp Lines Upper Snake Bear These data represent modeled stream temperatures for a portion of a larger dataset known as the Great Northern Landscape Conservation Cooperative (GNLCC) (https://www.fws.gov/science/catalog). This metadata record is a combined description for two spatial data feature types, vector lines and points, which cover the same geographic area. The line features are derived from NHDPlus (http://www.horizon-systems.com/NHDPlus/index.php) (USEPA and USGS, 2010) stream lines and the point data represent 1 km intervals along the NHDPlus stream network. Both datasets contain identical modeled stream temperature attributes. These modeled stream temperatures were generated as part of the U.S. Forest Service NorWeST stream temperature... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: Academics & scientific researchers, Data, Data.gov Great Northern Landscape Conservation Cooperative, EARTH SCIENCE > LAND SURFACE > LANDSCAPE, Federal resource managers, All tags... Informing Conservation Delivery, LCC Network Science Catalog, State agencies, completed, environment, hydrography, stream, temperature, water, Fewer tags NorWeST Observed Temp Points Upper Snake Bear These data represent stream temperature observation locations for a portion of a larger study area known as the Great Northern Landscape Conservation Cooperative (GNLCC) https://www.fws.gov/science/catalog. These data were collected and processed as part of the NorWeST stream temperature project http://www.fs.fed.us/rm/boise/AWAE/projects/NorWeST.htmlThese thermograph locations and the attendant temperature observations were used as the baseline data for the NorWeST stream temperature modeling project. As a result, modeled temperatures will be most reliable in areas with the greatest density of thermographs. These data reside in ESRI shapefile format, ArcGIS version 9.3. The point shapefile extents correspond to... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: Academics & scientific researchers, Data, Data.gov Great Northern Landscape Conservation Cooperative, EARTH SCIENCE > LAND SURFACE > LANDSCAPE, Federal resource managers, All tags... LCC Network Science Catalog, State agencies, completed, environment, hydrography, stream, temperature, water, Fewer tags Road-Killed Wildlife Carcass Frequency by Mile of Montana On-System Routes in the U.S. Northern Rockies (2008-2012) This layer represents 5-year relative counts of wildlife carcasses collected by Montana Department of Transportation (MDT) maintenance personnel or U.S. Fish & Wildlife Service Grizzly Bear Recovery Team personnel on or adjacent to on-system (major) routes from 2008 to 2012. To obtain relative counts, the 5-year total counts per mile, which included all wildlife species observed, were divided by the maximum observed calue (98) to give a relative 0-1 risk score. Total counts, which include all wildlife species observed, along with carnivore counts, which include only black bears, grizzly bears, mountain lions, and wolves, are provided. Counts were derived by identifying the nearest mile marker to each carcass point... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: Carnivores, Carnivores, Data, Data.gov Great Northern Landscape Conservation Cooperative, EARTH SCIENCE > LAND SURFACE > LANDSCAPE, All tags... LCC Network Science Catalog, Montana, Montana, Policy makers & regulators, Regional & county planners, Risk Assessment, Risk Assessment, Road mortality, Road mortality, Roadkill, Roadkill, Roads, Roads, State agencies, Transportation, Transportation, Ungulates, Ungulates, Western Montana, Western Montana, Wildlife, Wildlife, completed, environment, Fewer tags Final Report: Vulnerability of Riparian Obligate Species in the Rio Grande to the Interactive Effects of Fire, Hydrological Variation and Climate Change This project had two primary goals: 1) To develop a process for integrating data from multiple sources to improve predictions of climate impacts for wildlife species; and 2) To provide data on climate and related hydrological change, fire behavior under future climates, and species’ distributions for use by researchers and resource managers.We present within this report the process used to integrate species niche models, fire simulations, and vulnerability assessment methods and provide species’ reports that summarize the results of this work. Species niche model analysis provides information on species’ distributions under three climate scenarios and time periods. Niche model analysis allows us to estimate the... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: 2012, Applications and Tools, Data.gov Desert LCC, Decision Support, EARTH SCIENCE > HUMAN DIMENSIONS > ENVIRONMENTAL IMPACTS > CONSERVATION, All tags... Federal resource managers, Fire, Fire, Invasive species, Invasive species, LCC, LCC Network Science Catalog, Map, Methodology/Protocol, NM-01, NM-02, NM-03, New Mexico, New Mexico, Population & Habitat Evaluation/Projection, Report, Rio Grande, Rio Grande, Riparian, Riparian, Riparian obligates, Riparian obligates, Transboundary Madrean Watersheds Pilot Area, United States, Vulnerability, Vulnerability, Vulnerability Assessment, Wetlands, Wetlands, biota, completed, Fewer tags Invasive and Problematic Plant Stressors for Riparian Areas in the Chihuahuan Desert These heatmaps show a top 3 invasive and problematic plant stressor for riparian areas in the Chihuahuan Desert, as ranked by participants, and the concentration of participants who reported as working in each municipality or county who also voted for that stressor across the landscape. Symbology represents the percentage of participants with 0% = dark green, 0.0001 % - 24.99% = light green, 25% - 49.99% = yellow, 50% - 74.99% = orange, 75% - 100% = red. All counties and municipalities identified by participants as areas where they work were given a tally for each of the top 3 stressors that participants chose. Counties with a small number of participants were not adjusted for small sample size. These results were... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: Academics & scientific researchers, BIOSPHERE, BIOSPHERE, COMMUNITY DYNAMICS, COMMUNITY DYNAMICS, All tags... Complete, Conservation NGOs, Data, Data.gov Desert Landscape Conservation Cooperative, EARTH SCIENCE, EARTH SCIENCE, EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > TERRESTRIAL ECOSYSTEMS, ECOLOGICAL DYNAMICS, ECOLOGICAL DYNAMICS, Federal resource managers, INVASIVE SPECIES, INVASIVE SPECIES, LCC Network Science Catalog, Policy makers & regulators, State agencies, desert lcc, dos rios, ecosystem services, ecosystem stressors, environment, Fewer tags Ecosystem Functionality Stressors for Riparian Areas in the Chihuahuan Desert These heatmaps show a top 3 riparian ecosystem functionality stressor, as ranked by participants, and the concentration of participants who reported as working in each municipality or county who also voted for that stressor across the landscape. Symbology represents the percentage of participants with 0% = dark green, 0.0001 % - 24.99% = light green, 25% - 49.99% = yellow, 50% - 74.99% = orange, 75% - 100% = red. All counties and municipalities identified by participants as areas where they work were given a tally for each of the top 3 stressors that participants chose. Counties with a small number of participants were not adjusted for small sample size. These results were shared via a webinar hosted by the Desert... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: Academics & scientific researchers, Complete, Conservation NGOs, Data, Data.gov Desert Landscape Conservation Cooperative, All tags... EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS, EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > TERRESTRIAL ECOSYSTEMS, Federal resource managers, LCC Network Science Catalog, Policy makers & regulators, State agencies, desert lcc, dos rios, ecosystem services, ecosystem stressors, environment, Fewer tags Conservation Parcels Scored - Rio Mora Crucial Habitat Assessment These data represent 1 sq. mile Hexagons and are derived from the Western Governors Association Crucial Habitat Assessment Tool. The hexagons have been attributed with summary values from the datasets described above. Field names correspond to the number datasets above as follows: {1:’wetland_deds’, 2:’wetland_ceds’, 3:’cropland_ceds’, 4:’lasp_grsp_casp_suit’, 5:’lasp_grsp_suit’, 6:’riparian_suit’, 7:’mean_sat_thick_ft’, 8:’tillage_suit’, 9:’wind_suit’, 10:’ann_aq_deplet_ft’, 11:’wetland_deds_2040’, 12:’wetland_ceds_2040’, 13:’lbgrasslands_2017’, 14:’lbgrasslands_2022’, 15:’lbgrasslands_2027’, 16:’mean_sat_thick_2050_ft’, 17:’tillage_suit_2050’}. Zonal statistic attribution methods are as follows: {1:’SUM’, 2:’SUM’,... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: 2014, Consevation design, Data, Datasets/Database, EARTH SCIENCE SERVICES > MODELS > CLIMATE CHANGE IMPACT ASSESSMENT MODELS, All tags... Federal resource managers, Great Plains Landscape Conservation Cooperative, LCC, LCC Network Science Catalog, Policy makers & regulators, Regional & county planners, State agencies, completed, data.gov Great Plains LCC, environment, environment, Fewer tags Vulnerability of Riparian Habitat to Land Uses in the Green River Basin For the Green River Basin Landscape Conservation Design (GRB LCD) assessment, we mapped the vulnerability of riparian habitat for terrestrial species and process. Using a vulnerability framework, we defined Sensitivity (S) as the percent riparian vegetation within the valley bottom and Exposure (E) as the amount of human modification within the valley bottom. For each 12-digit hydrologic unit code within the GRB LCD we summarized the riparian sensitivity and exposure to human modification. We also computed Potential Impact (PI), and Adaptive Capacity (AC) metrics at the HUC12 level. PI is the square root transformed product of human modification exposure and riparian sensitivity. AC for riparian exposure to human... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Colorado, Colorado, EARTH SCIENCE > LAND SURFACE > LANDSCAPE, Green River Basin, Green River Basin, All tags... LCC Network Science Catalog, LCC Network Science Catalog, Utah, Utah, Wyoming, Wyoming, biota, biota, completed, environment, green river basin, human modification, human modification, human modification, land uses, landscape conservation design, landscape conservation design, landscape conservation design, map, riparian, riparian, riparian, vulnerability, vulnerability, vulnerability, Fewer tags Shale gas data used in development of the Disturbance Intensity Index for the Pennsylvania portion of the Upper Susquehanna River basin in Maloney et al. 2018 Data on 17 metrics of shale gas development in the Pennsylvania portion of the Upper Susquehanna River basin that was collated from a variety of sources and summarized at the upstream catchment scale. Data were also standardized by upstream area and transformed into rank scores based on metric distribution and then summarized into a Disturbance Intensity Index (DII). See Maloney et al. 2018 for detailed descriptions of each data sets and limitations of data. (Maloney, K. O., J. A. Young, S. P. Faulkner, A. Hailegiorgis, E. T. Slonecker, and L. E. Milheim. 2018. A detailed risk assessment of shale gas development on headwater streams in the Pennsylvania portion of the Upper Susquehanna River Basin, U.S.A. Science... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Ecology, Pennsylvania portion of the Upper Susquehanna River basin, USGS Science Data Catalog (SDC), biota, environment, All tags... inlandWaters, Fewer tags Airborne Geophysical Surveys over the Eastern Adirondacks, New York State Airborne geophysical surveys were conducted in the eastern Adirondacks from Dec. 7, 2015 - Dec. 21, 2015, by Goldak Airborne Surveys. The area was flown along a draped surface with a nominal survey height above ground of 200 meters. The flight line spacing was 250 meters for traverse lines and 2500 meters for control lines. Here we present downloadable magnetic and radiometric (gamma spectrometry) data from those surveys as image (Geotiff) and flight line data (csv format). Background The Eastern Adirondacks region was known for iron mining in the 1800's and 1900's but it also contains deposits of rare earth minerals. Rare earth minerals are used in advanced technology such as in cell phones, rechargeable batteries... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Adirondack Mountains, CGGSC, Crustal Geophysics and Geochemistry Science Center, Essex County, Geophysics, All tags... MRP, Mineral Resources, Mineral Resources Program, New York, Remote Sensing, USGS Science Data Catalog (SDC), United States, aeromagnetic maps, aeromagnetic surveying, aeroradiometric surveying, airborne magnetics, economy, geologic mapping, geologic maps, geoscientificInformation, magnetic anomaly maps, magnetic field (earth), magnetics, mineral resources, mineral resources, subsurface imaging, subsurface maps, Fewer tags Principal facts of gravity data in the southern San Luis Basin, northern New Mexico Gravity data were collected from 2006 through 2015 to assist in mapping subsurface geology in the southern San Luis Basin, northern New Mexico. This data release provides principal facts for 566 new gravity stations that were acquired to fill in gaps in the existing public gravity data coverage. Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Geophysics, Questa, Rio Arriba County, Taos, Taos County, All tags... Tres Piedras, USGS Science Data Catalog (SDC), bouguer anomaly, free-air anomaly, geoscientificInformation, gravimeter measurement, gravitational field (earth), isostatic anomaly, Fewer tags Airborne magnetic and radiometric survey, southeast Missouri and western Illinois, 2018-2019 This publication provides digital flight line data for a high-resolution horizontal magnetic gradient and radiometric survey over an area of southeast Missouri and western Illinois. The survey represents the first airborne geophysical survey conducted as part of the U.S. Geological Survey (USGS) Earth Mapping Resource Initiative (Earth MRI) effort (Day, 2019). Earth MRI is a cooperative effort between the USGS, the Association of American State Geologists, and other Federal, State, and private sector organizations to improve our knowledge of the geologic framework of the United States. Data for this survey were collected by Terraquest, Ltd. under contract with the USGS using a fixed wing aircraft with magnetometers... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Earth Mapping Resources Initiative, EarthMRI, GGGSC, Geology, Geophysics, and Geochemistry Science Center, Illinois, All tags... Ironton, MRP, Mineral Resources Program, Missouri, USGS Science Data Catalog (SDC), aeromagnetic surveying, aeroradiometric surveying, airborne geophysical survey, economy, geophysics, geoscientificInformation, geospatial datasets, horizontal magnetic gradiometry, none, potassium, thorium, uranium, Fewer tags « 1 2 3 4 5 6 ... »