GYPSUM DEPOSITS OF CALIFORNIA - USGS
Gives a short description of the gypsum deposits at Point Sal, Santa Barbara County. Dr. Stephen Bowers gives a description of a gypsum deposit in the Ojai Valley, Ventura County, which is repeated in Fairbanks's report. HOBSON, J. B. Point Sal gypsum mines: Tenth Ann. Kept. State Mineralogist, Sacramento, 1890, p. 601.