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 Gonzales CA 1955. Photorevised 1984. DMA 1757 III SW, series V895 and Mount Johnson CA 1968. Photorevised 1984. DMA 1757 III SE, series V895." "First printing, June 2006." Includes quadrangle location map, index to adjacent 7.5 minute quadrangles, and index to sources of geology. Includes "pertinent references."