1938. 2018-04-16T17:53:08Z. 2020-10-13T22:38:22Z. Jonas, Anna I. (Anna Isabel), 1881-1974, author, cartographer. Maryland Geological Survey. English. cartographic image. Public. Maryland, Frederick County, Washington County, Carroll County, Carroll County., Frederick County., and Washington County.
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2. Geologic observations along a pipeline trench in Frederick County, Maryland [cartographic material]
1984. 2023-09-01T16:34:45Z. 2023-09-02T03:02:58Z. Davies, William Edward, 1917-. U.S. Geological Survey. English. cartographic image. Public. Maryland, Frederick County, and Frederick County.
