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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.
1941. 2018-04-16T18:07:01Z. 2018-04-16T18:07:01Z. Cloos, Ernst, 1898-1974. Maryland Geological Survey. English. cartographic image. Public. Maryland, Washington County, and Washington County.
1947. 2018-05-01T19:15:41Z. 2020-10-02T18:05:11Z. White, George W. (George Willard), 1903-1985. State of Ohio, Dept. of Public Works, Geological Survey of Ohio. English. cartographic image. Public. Ohio, Noble County, Washington County, Morgan County, Morgan County., Noble County., and Washington County.