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Big Boy deposit, Zenia, Coastal Range, Trinity Co., California, USA

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Trask, Parker Davies, Ivan F. Wilson & F.S. Simons (1943), Manganese deposits of California – a summary report: California Division Mines Bulletin 125: 195.

Trask, Parker Davies (1950) Geologic description of the manganese deposits of California. California Division of Mines Bulletin 152, 378 pp.: 306.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10033669 & 10117768.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0061050010.

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