1. Map and geotechnical properties of surface materials of the Culpeper Basin and vicinity, Virginia and Maryland [cartographic material] Yale Public content 1985. 2002-06-01T04:00:00Z. 2015-07-14T22:20:37Z. Geological Survey (U.S.). The Survey ; For sale by the Branch of Distribution, USGS. English. cartographic image. Public. Virginia, Maryland, and U.S.