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 Cosio Knob CA 1949. Photorevised 1984. DMA 1756 II SW - series V895." "First printing, February 2007." Includes quadrangle location map, index to adjacent 7.5 minute quadrangles, and index to sources of geology, most recent field work 2003. Includes "pertinent references", most recent 1979.