1. Map showing inferred relative permeability of geologic materials in the Parker quadrangle, Arapahoe and Douglas Counties, Colorado [cartographic material] Yale Public content 1972. 2013-02-21T19:52:53Z. 2013-03-18T20:56:39Z. Maberry, John O., 1935-. U.S. Geological Survey. English. Public. Colorado, Arapahoe County, and Douglas County.