1. Maps showing ground-water conditions in the lower San Pedro Basin area, Pinal, Cochise, Pima, and Graham Counties, Arizona-1979 [cartographic material] Yale Public content 1980. 2002-06-01T04:00:00Z. 2022-12-09T04:08:27Z. Geological Survey (U.S.). The Survey. English. cartographic image. Public. Arizona and Arizona.