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7. Geologic map of Allegany County

Yale Public content
1956. 2018-04-16T18:11:28Z. 2018-04-16T18:11:28Z. Geological Survey (U.S.). The Dept. English. cartographic image. Public. Maryland, Allegany County, Allegany County (Md.), and Allegany County.

8. Geologic map of Indiana

Yale Public content
1956. 2018-05-21T18:14:34Z. 2018-05-21T18:14:34Z. Patton, John B. (John Barratt), 1915- cartographer. Indiana Geological Survey. English. cartographic image. Public. Indiana, Indiana., and États-Unis.