After 1930
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Main Author:
Darton, N.H.
Title/Description:
Map Showing Distribution Of Gravel And Sand Deposits In And Near Washington D.C.
Publication Info:
Washington: Department of the Interior, US Geological Survey, 1938; Bulletin 906, Plate 1
Date:
1938
Scale:
1:62,500
Original Source:
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Main Author:
U.S. Geological Survey
Title/Description:
Map Showing Depth To Bedrock In Part Of Washington, District Of Columbia
Publication Info:
Washington: Department of the Interior, U.S. Geologic Survey, 1951: Professional Paper 217, Plate 2
Date:
1951
Scale:
1:16,800
Original Source:
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Main Author:
U.S. Geological Survey
Title/Description:
Map Showing Configuration of Bedrock Surface in the District of Columbia Region
Publication Info:
Washington, D.C.: Department of the Interior, U.S. Geologic Survey, 1951; Professional Paper 217, Plate 1
Date:
1951
Scale:
1:31,680
Original Source: