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 Bickmore Canyon, CA 1968; photorevised 1984. DMA 1757 II SW - series V895." "First printing, May 2007." "Robert L. Countryman honorary map." Includes location map, index to adjacent 7.5 minute quadrangles, and index to sources of geology, most recent 1973. Includes "pertinent references", most recent 1999.