"Base map from U.S. Geological Survey state map. Base revised as to cities and towns on F.A.H.S. [Federal Aid Highway System] and county lines by Bureau of Public Roads, Feb. 1, 1929."
Includes text, index, inset of "Map of California, showing major rock units and their significance to exploration for chromite deposits," diagram, and 4 graphs.
"Revised and redrawn 1920 in cooperation with California State Dept. of Engineering; College of Agriculture, University of California; California State Water Commission."
"Map corrected and revised 1936 by Division of Irrigation Investigation, University of California and California Unit, Land-Use Planning Section, Resettlement Administration."