1. Chemical quality of ground water in the Culpeper Basin, Virginia and Maryland [cartographic material] Yale Public content 1983. 2015-07-01T15:22:17Z. 2015-07-14T22:10:21Z. Posner, Alex. U.S. Geological Survey. English. cartographic image. Public. Virginia, Maryland, Culpeper Basin (Va. and Md.), and U.S.