1. Geologic map of the Mount Abbot quadrangle, Central Sierra Nevada, California [cartographic material] Yale Public content 1975. 2012-04-19T20:08:55Z. 2012-05-03T15:40:25Z. Lockwood, John P. U.S. Geological Survey. English. Public. California, Sierra Nevada (Calif. and Nev.), and Fresno County.