1. Map showing relative swelling-pressure potential of geologic materials in the Parker quadrangle, Arapahoe and Douglas Counties, Colorado [cartographic material] Yale Public content 1972. 2013-02-21T15:57:16Z. 2013-03-18T20:56:37Z. Maberry, John O., 1935-. U.S. Geological Survey. English. Public. Colorado, Arapahoe County, and Douglas County.