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"OpenStreetMap contributors"
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From the site: "Coverages showing political boundaries, map indexes, regions, area development districts (ADDs), grids, etc."
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USGS map of surficial deposits across the eastern half of the United States. Various downloadable versions of the map are available.
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From the site: "AAPG Datapages and the GIS Publications Committee wish to thank Robertson (a CGG Company) for allowing the Robertson Tellus Sedimentary Basins of the World Map...
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From the site: "AAPG Datapages and the AAPG GIS Publications Committee wish to thank Dr. M. K. (Mike) Horn for allowing his Giant Oil and Gas Fields of the World GIS project to...
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From the site: "A GIS database of geologic units and structural features in North Carolina, with lithology, age, data structure, and format written and arranged just like the...
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From the site: "A GIS database of geologic units and structural features in Pennsylvania, with lithology, age, data structure, and format written and arranged just like the...
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From the site: "A GIS database of geologic units and structural features in Virginia, with lithology, age, data structure, and format written and arranged just like the other...
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From the site: “A Digital Raster Graphic (DRG) is a scanned image of a U.S. Geological Survey (USGS) topographic map. An unclipped scanned image includes all marginal...
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From the site: “A Digital Raster Graphic (DRG) is a scanned image of a U.S. Geological Survey (USGS) topographic map. An unclipped scanned image includes all marginal...
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From the site: "Layered GeoPDF 7.5 Minute Quadrangle Map. Layers of geospatial data include orthoimagery, roads, grids, geographic names, elevation contours, hydrography, and...
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From the site: "Late in 1994, the Pennsylvania Bureau of Topographic and Geologic Survey was asked to develop a digital physiographic provinces map at 1:100,000 scale. The...
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From the site: "A GIS database of geologic units and structural features in Tennessee, with lithology, age, data structure, and format written and arranged just like the other...
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From the site: "A GIS database of geologic units and structural features in New York, with lithology, age, data structure, and format written and arranged just like the other...
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From the site: "Airborne measurement of the earth's magnetic field over all of North America provides gridded data describing the magnetic anomaly caused by variations in earth...
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Website with information about Virginia water bodies, water quaity, and data from the National Watershed Boundary Dataset. Includes maps of River Basins in VA and other useful...
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Easy access to census data in map, KML, shapefile, and other formats. Could be used for GIS mapping.
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Collection of various datasets in esri shapefile format for download; includes hydrography and geology data.
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From the site: "Bedrock geology [map] . . . Created by the WV Geological and Economic Survey (WVGES) in 1999 as part of their ongoing statewide digital geologic mapping project....
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The Physiographic Map of Maryland consists of 2 sections. The first section is Explanatory Text for the Physiographic Map of Maryland (Open File Report 08-03-1 ). This...
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From the site: "This map includes short descriptions of geologic units and a cross section showing the distribution of geologic units under the earth’s surface. Among other...
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