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Some web sites we know about that have DRG files available for free download are listed below. Usually these files are quite large. The average size of a 7.5-minute DRG is about 8 megabytes.
1:100,000-Scale DRG's of Nevada are available at the Nevada Bureau of Mines and Geology FTP Site.
DRG's of all Pennsylvania 1:24,000, 1:100,000, and 1:250,000 scale topographic maps are available for downloading from the Pennsylvania Spatial Data Access Site
DRG's of Texas are available from the Texas Natural Resource Conservation Commission
DRG's for parts of 8 upper mid-western states are available online from the USGS-Environmental Management Technical Center
DRG's for West Virginia are available from the West Virginia Division of Environmental Protection
DRG's for Florida are available from the Florida Dept. of Environmental Protection - Land Boundary Information System
DRG's for Wyoming are available from the Wyoming Spatial Data Clearinghouse
DRG's for Montana are available from the Montana State Library's - Natural Resource Information System
DRG's for Missouri are available from MSDIS - DRG Quad List - DRG's
DRG's for Idaho are available by downloading the GeoLibrary software
DRG's for Arkansas are available from The University of Arkansas-Spatial Analysis Lab
DRG's for Nebraska are available from the Conservation and Survey Division (CSD) of the University of Nebraska-Lincoln
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