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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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This map layer includes Global Map data showing cities and towns in the United States, Puerto Rico, and the U.S. Virgin Islands. The data are a modified version of the National Atlas of the United States 1:1,000,000-scale cities and towns of the United States; those source data were derived from the Geographic Names Information System (GNIS) and the U.S. Census Bureau National Places Gazetteer files. Global Map refers to these locations as Built-up Area (point) and defines them as areas containing a concentration of buildings and other structures (smaller than Built-up Area (face)). National Atlas cities or towns are defined as places with a recorded population, usually with at least one central area that provides...
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map background search result map search result map USGS Small-scale Dataset - Global Map: Cities and Towns of the United States 201403 Shapefile 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 US Topo 7.5-minute map for Alger, OH 2016 USGS US Topo 7.5-minute map for Businessburg, OH-WV 2016 USGS US Topo 7.5-minute map for Carey, OH 2016 USGS US Topo 7.5-minute map for Jersey, OH 2016 USGS US Topo 7.5-minute map for Alfred, OH 2016 USGS US Topo 7.5-minute map for Aurora, OH 2016 USGS US Topo 7.5-minute map for Ayersville, OH 2016 USGS US Topo 7.5-minute map for Cambridge, OH 2016 USGS US Topo 7.5-minute map for Carrollton, OH 2016 USGS US Topo 7.5-minute map for Dalton, OH 2016 USGS US Topo 7.5-minute map for Johnstown, OH 2016 USGS US Topo 7.5-minute map for McComb, OH 2016 USGS Topo Map Vector Data (Vector) 47851 Waynesville, Ohio 20170226 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 49989 Xenia, Ohio 20170228 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 23561 Kimbolton, Ohio 20170309 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 31814 New Paris, Ohio 20170310 for 7.5 x 7.5 minute FileGDB 10.1 USGS US Topo 7.5-minute map for Alger, OH 2016 USGS US Topo 7.5-minute map for Businessburg, OH-WV 2016 USGS US Topo 7.5-minute map for Carey, OH 2016 USGS US Topo 7.5-minute map for Jersey, OH 2016 USGS US Topo 7.5-minute map for Alfred, OH 2016 USGS US Topo 7.5-minute map for Aurora, OH 2016 USGS US Topo 7.5-minute map for Ayersville, OH 2016 USGS US Topo 7.5-minute map for Cambridge, OH 2016 USGS US Topo 7.5-minute map for Carrollton, OH 2016 USGS US Topo 7.5-minute map for Dalton, OH 2016 USGS US Topo 7.5-minute map for Johnstown, OH 2016 USGS US Topo 7.5-minute map for McComb, OH 2016 USGS Topo Map Vector Data (Vector) 47851 Waynesville, Ohio 20170226 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 49989 Xenia, Ohio 20170228 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 23561 Kimbolton, Ohio 20170309 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 31814 New Paris, Ohio 20170310 for 7.5 x 7.5 minute FileGDB 10.1 USGS Small-scale Dataset - Global Map: Cities and Towns of the United States 201403 Shapefile 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