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Images of Contra Costa County (Calif.) -- Maps and Contra Costa County (Calif.) -- Maps
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[Field map: Topography and g
1922
Title |
[Field map: Topography and geology of the Baseline area (area 14), Pleasanton quadrangle |
Creators |
Ewing, Sydney C. |
Date |
1922 |
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California
1924
Title |
California |
Creators |
Stanford Geological Survey. |
Date |
1924 |
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