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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, U.S. Geological Survey, 1938; Bulletin 906, Plate 1
Date:
1938
Scale:
1:62,500
Original Source:
Geological Survey of Alabama
Viewing options:
JPEG
or
Plugin
Main Author:
Darton, N.H.
Title/Description:
Map Showing the Depth to Bedrock in part of Washington, District of Columbia
Publication Info:
Washington: Department of the Interior, U.S. Geological Survey, 1951; Professional Paper 217, Plate 2
Date:
1951
Scale:
1:16,800
Original Source:
Geological Survey of Alabama
Viewing options:
JPEG
or
Plugin
Main Author:
U.S. Geological Survey
Title/Description:
Map Showing the Configuration of Bedrock surface in the District of Columbia Region
Publication Info:
Washington: Department of the Interior, U.S. Geological Survey, 1951; Professional Paper 217, Plate 1
Date:
1951
Scale:
1:31,680
Original Source:
Geological Survey of Alabama
Viewing options:
JPEG
or
Plugin
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