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Geologic Atlas: Piedmont folio, West Virginia-Maryland
From the site: “The Geologic Atlas of the United States is a set of 227 folios published by the U.S. Geological Survey between 1894 and 1945. Each folio includes both... -
Rock Creek Park Field Plots Data Base for Vegetation Mapping
The National Park Service (NPS), in conjunction with the Biological Resources Division (BRD) of the U.S. Geological Survey (USGS), has implemented a program to "develop a...