1. Folio of land use in the Washington, D.C., urban area. [cartographic material] / Census tracts, 1970, Washington urban area, D.C., Md., and Va Yale Public content 1974. 2013-06-13T20:27:10Z. 2013-06-26T19:51:19Z. Geological Survey (U.S.). Dept. of the Interior, U.S. Geological Survey. English. Public. Washington (D.C.) and Washington Metropolitan Area.