Calkins, Frank C. Molybdenite and nickel ore in San Diego county California / by F.C. Calkins.

Calkins, Frank C.

Molybdenite and nickel ore in San Diego county California / by F.C. Calkins.

Washington : Govt. Print. Off., 1916.

Includes bibliographical references.

Molybdenite near Romona, San Diego County, Cal. -- An occurence of nickel ore in San Diego County, Cal.

Nickel ores -- California -- San Diego County.

Ore deposits -- California -- San Diego County.

Molybdenite -- California -- San Diego County.

Geological Survey (U.S.)

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