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"OpenStreetMap contributors"
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From the site: "The Geographic Information Retrieval and Analysis System (GIRAS) was developed in the mid 70s to put into digital form a number of data layers which were of...
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Gathering Resources...From the site: "This map layer contains the shallowest principal aquifers of the conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands, portrayed as...-
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Gathering Resources...USGS Water information; multiple downloadable datasets with spacial data and metadata. Sets range from surface geology to historical data about aquifers.-
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Gathering Resources...USGS GIS data of the United States water resources maps, soil, hydrology, and weather. Contains multiple links to useful and informative websites.-
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Gathering Resources... -