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 Copper Mountain CA 1956, photorevised 1971, photoinspected 1978. DMA 1758 IV NE, series V895." "First printing, August 2007." Includes quadrangle location map, index to adjacent 7.5 minute quadrangles, and index to sources of geology. Edward C. "Ben" Cahill honorary map. Includes "pertinent references", most recent published in 1973.