Digital Maps and Geospatial Data | Princeton University
Sedimentary formations of Washington, D.C., and vicinity
- [Reston, Va.] : U.S. Geological Survey, 1947.
- U.S.G.S. United States. Geological Survey Alternate title in right upper margin: Maryland, Virignia, District of Columbia. Polyconic projection. "Geologic mapping completed in 1942." "Base surveyed in 1913-1915. Revised in 1941-1942."
- Geology and Washington Metropolitan Area—Maps
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