by Thomas W. Dibblee, Jr. ; edited by John A. Minch. Relief shown by contours and spot heights. "Topographic base maps from available USGS 7.5-minute quadrangle RIVERSIDE EAST, CA 1967, AMS 2551 IV NE - V895, photorevised 1973; SAN BERNARDINO SOUTH, CA 1967 AMS 2552 III SE - Series V 895, photorevised 1973." "First printing, December 2003." Includes quadrangle location map, index to adjacent 7.5 minute quadrangles, and index to sources of geology. Includes "pertinent references."