by Thomas W. Dibblee, Jr. ; edited by John A. Minch. Relief shown by contours and spot heights. "Topographic base map from available USGS 7.5-minute quadrangle Wells Ranch, CA 1954; DMA 2054 II SW -- Series V895. Photoinspected 1971" "First printing, December 2005." Includes quadrangle location map, index to adjacent 7.5 minute quadrangles, and index to sources of geology (most recent Vedder & Repenning, 1975, modified). Includes "pertinent references."