by Thomas W. Dibblee, Jr.; edited by Helmut E. Ehrenspeck. Relief shown by contours and spot heights. "Prepared in cooperation with the California Department of Conservation, Division of Mines and Geology; U.S. Forest Service, Angeles National Forest; and U.S. Geological Survey." "William R. Muehlberger Honorary Map." "First printing, May 1997". Includes acknowledgments, index to sources of geology, 2 col. cross-sections, and location map. Includes bibliography.