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1920. 2013-03-15T13:09:18Z. 2013-03-15T13:09:18Z. Bascom, F. (Florence), 1862-1945. United States Geological Suvery. English. Public. Maryland, Cecil County, Delaware, New Castle County, New Jersey, Salem County, Pennsylvania, and Chester County.
1966. 2018-05-29T17:57:58Z. 2018-05-29T17:57:58Z. Spoljaric, Nenad. Delaware Geological Survey. English. cartographic image. Public. Delaware and Delaware.
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1987. 2018-05-11T18:55:29Z. 2018-09-05T19:36:27Z. Fuller, H. Kit. Dept. of the Interior, U.S. Geological Survey. English. cartographic image. Public. Maryland, Delaware, Washington (D.C.), Delaware., and Maryland.
2007. 2008-01-08T13:56:33Z. 2011-03-29T00:20:26Z. Ramsey, Kelvin W. Delaware Geological Survey. English. Public. Delaware and Kent County.
2001. 2008-09-08T18:55:23Z. 2011-03-25T22:58:31Z. Ramsey, Kelvin W. Del. Geological Survey, University of Del. English. Public. Delaware, Ellendale Region, and Milton Region.
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