1. Map showing geology, structure, and oil and gas fields in the Sterling 1° x 2° quadrangle, Colorado, Nebraska, and Kansas [cartographic material] Yale Public content 1978. 2014-04-08T14:43:36Z. 2014-04-22T22:18:07Z. Scott, Glenn R., 1918-2012. U.S. Geological Survey. English. Public. Colorado, Nebraska, and Kansas.