1. Geologic map of the Fredericksburg 30ʹ x 60ʹ quadrangle, Virginia and Maryland [cartographic material] Yale Public content 2000. 2002-06-01T04:00:00Z. 2016-03-07T18:21:32Z. Geological Survey (U.S.). The Survey ; Information Services [distributor]. English. Public. Virginia, Fredericksburg Region, Maryland, and Charles County.