by Thomas W. Dibblee, Jr. ; edited by John A. Minch. Relief shown by contours and spot heights. "Andrew Lawson Memorial Map." "Topographic base map from available USGS 7.5-minute quadrangle Clayton, CA 1953, DMA 1659 IV NW - Series V895, Photorevised 1980, minor revision 1994." "First printing, February 2006." Includes quadrangle location map, index to adjacent 7.5 minute quadrangles, and index to sources of geology. Includes "pertinent references."