OF CALIFORNIA Bulletin 156 1950 DIVISION OF MINES FERRY BUILDING. SAN FRANCISCO r^ ^\ n^ p \/...RESOURCES WARREN T. HANNUM, Director DIVISION OF MINES FERRY BUILDING, SAN FRANCISCO OLAF P. JENKINS. Chiei...RESOURCES Prepared by the Staff of the DIVISION OF MINES Under the Direction OLAF P. of lENKINS CONTRIBUTING...UNITED STATES DEPARTMENT OF THE INTERIOR, BUREAU OF MINES LETTER OF TRANSMITTAL r# Excellency, The Honorable...California, prepared by the staff of the Division of Mines under the dii-eetion of its Chief, Olaf P. Jenkins |