1. Complete Bouguer gravity anomaly map of the Silver City 1° x 2° quadrangle, New Mexico-Arizona [cartographic material] Yale Public content 1981. 2015-06-29T19:59:32Z. 2015-07-14T22:10:12Z. Wynn, Jeffrey C. U.S. Geological Survey. English. cartographic image. Public. New Mexico, Grant County, Luna County, Hidalgo County, Arizona, Greenlee County, Cochise County, Graham County, and U.S.