1. Geologic map of the Piedmont in the Beltsville, Laurel, and Washington East quadrangles, Montgomery, Prince Georges, Howard, and Anne Arundel counties, Maryland, and the District of Columbia [microform] Yale Public content 1998. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey. English. Public. Maryland, Montgomery County, Prince Georges County, Howard County, Anne Arundel County, and Washington (D.C.).