Geology and mineral resources of San Diego and Imperial counties - Merrill, Frederick J. H. (Frederick James Hamilton), 1861-1916.; California State Mining Bureau ([San Francisco?] California State Printing Office, 1914)
At head of title: California State Mining Bureau.
Cover-title: Mines and mineral resources of Imperial County, San Diego County; chapters of state mineralogist's report, biennial period, 1913-1914.
Bibliography: p. 113.
Keywords: Geology -- California; Mines and mineral resources -- California