11. Slope map of the Parker quadrangle, Arapahoe and Douglas Counties, Colorado [cartographic material]
1972. 2013-02-21T16:40:27Z. 2013-03-18T20:56:37Z. Maberry, John O., 1935-. U.S. Geological Survey. English. Public. Colorado, Arapahoe County, and Douglas County.
