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Field spikes were prepared at 207 stream and river sites as part of the U.S. Geological Survey (USGS) National Water Quality Assessment (NAWQA) project between December, 2012, and September, 2015. At the field site, a depth-and width-integrated environmental sample was collected, and one subsample of the environmental sample was spiked with a known amount of a spike mixture. Both the spiked subsample ("spike sample") and another subsample ("environmental sample") of the original water sample were analyzed for pesticides at the USGS National Water Quality Laboratory (NWQL) by direct injection liquid chromatography with tandem mass spectrometry (LC-MS/MS), and were used to calculate the spike recovery of each analyte....
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Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
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Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
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Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
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Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
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Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
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Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
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Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
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Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
thumbnail
Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
thumbnail
Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
thumbnail
Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
thumbnail
Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
thumbnail
Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
thumbnail
Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.


map background search result map search result map USGS Small-scale Dataset - Congressional Districts of the United States - 110th Congress 200710 Shapefile USGS Small-scale Dataset - Congressional Districts of the United States - 112th Congress 201101 Shapefile USGS Combined Vector for Ellison, Nevada 20160824 7.5 x 7.5 minute Shapefile USGS Combined Vector for Gillis Canyon NW, Nevada 20160824 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Lambs Pond, Nevada 20160824 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Little Fish Lake, Nevada 20160823 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Manhattan Mountain NE, Nevada 20160824 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Manhattan Mountain, Nevada 20160824 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Mount Callaghan, Nevada 20160823 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Anchorite Hills, Nevada 20160830 7.5 x 7.5 minute Shapefile USGS Combined Vector for Antelope Mountain, Nevada 20160825 7.5 x 7.5 minute Shapefile USGS Combined Vector for Bailey Pass, Nevada 20160825 7.5 x 7.5 minute Shapefile USGS Combined Vector for Bernice Canyon, Nevada 20160824 7.5 x 7.5 minute Shapefile USGS Combined Vector for Grass Valley Wash, Nevada 20160824 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Jumbo Peak, Nevada 20160825 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Mahogany Mountain, Nevada 20160824 7.5 x 7.5 minute Shapefile USGS Combined Vector for Manhattan, Nevada 20160824 7.5 x 7.5 minute Shapefile USGS Combined Vector for Mound Spring, Nevada 20160830 7.5 x 7.5 minute Shapefile USGS Combined Vector for Pequop Summit SW, Nevada 20160823 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Ellison, Nevada 20160824 7.5 x 7.5 minute Shapefile USGS Combined Vector for Gillis Canyon NW, Nevada 20160824 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Lambs Pond, Nevada 20160824 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Little Fish Lake, Nevada 20160823 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Manhattan Mountain NE, Nevada 20160824 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Manhattan Mountain, Nevada 20160824 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Mount Callaghan, Nevada 20160823 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Anchorite Hills, Nevada 20160830 7.5 x 7.5 minute Shapefile USGS Combined Vector for Antelope Mountain, Nevada 20160825 7.5 x 7.5 minute Shapefile USGS Combined Vector for Bailey Pass, Nevada 20160825 7.5 x 7.5 minute Shapefile USGS Combined Vector for Bernice Canyon, Nevada 20160824 7.5 x 7.5 minute Shapefile USGS Combined Vector for Grass Valley Wash, Nevada 20160824 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Jumbo Peak, Nevada 20160825 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Mahogany Mountain, Nevada 20160824 7.5 x 7.5 minute Shapefile USGS Combined Vector for Manhattan, Nevada 20160824 7.5 x 7.5 minute Shapefile USGS Combined Vector for Mound Spring, Nevada 20160830 7.5 x 7.5 minute Shapefile USGS Combined Vector for Pequop Summit SW, Nevada 20160823 7.5 x 7.5 minute FileGDB 10.1 USGS Small-scale Dataset - Congressional Districts of the United States - 110th Congress 200710 Shapefile USGS Small-scale Dataset - Congressional Districts of the United States - 112th Congress 201101 Shapefile