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Heyl, George Richard (1948b), Ore deposits of Copperopolis, Calaveras County, California: California Division Mines Bulletin 144: 93-110.

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Year1948
Original EntryHeyl, George Richard (1948b), Ore deposits of Copperopolis, Calaveras County, California: California Division Mines Bulletin 144: 93-110.
Mindat Ref. ID16180300Long-form Identifiermindat:1:5:16180300:1
GUID0
Full ReferenceHeyl, George Richard (1948b), Ore deposits of Copperopolis, Calaveras County, California: California Division Mines Bulletin 144: 93-110.
Plain TextHeyl, George Richard (1948b), Ore deposits of Copperopolis, Calaveras County, California: California Division Mines Bulletin 144: 93-110.

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Calaveras County, California, USA

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Heyl, George Richard (1948b), Ore deposits of Copperopolis, Calaveras County, California: California Division Mines Bulletin 144: 109.
Heyl, George Richard (1948d), Ore deposits of Copperopolis, Calaveras County, California: California Division Mines Bulletin 144: 93-110.
Heyl, George Richard (1948b), Ore deposits of Copperopolis, Calaveras County, California: California Division Mines Bulletin 144: 96-97, 106-108.
Heyl, George Richard (1948b), Ore deposits of Copperopolis, Calaveras County, California: California Division Mines Bulletin 144: 96-97, 103-106.
Heyl, George Richard (1948c) The zinc-copper mines of the Quail Hill area, Calaveras County, California. California Division Mines Bulletin 144: 124-125.
Heyl, George Richard (1948c) The zinc-copper mines of the Quail Hill area, Calaveras County, California. California Division Mines Bulletin 144: 125-126.
Heyl, George Richard (1948c) The zinc-copper mines of the Quail Hill area, Calaveras County, California. California Division Mines Bulletin 144: 111-126.
Heyl, George Richard (1948c) The zinc-copper mines of the Quail Hill area, Calaveras County, California. California Division Mines Bulletin 144: 122-124.
Heyl, George Richard, Cox, M.W. and Eric, J.H. (1948a) Penn zinc-copper mine, Calaveras County, California. California Division Mines Bulletin 144: 61-84
Heyl, George Richard, Cox, M.W. and Eric, J.H. (1948) Penn zinc-copper mine, Calaveras County, California. California Division Mines Bulletin 144: 61-84.
Heyl, George Richard (1948c) The zinc-copper mines of the Quail Hill area, Calaveras County, California. California Division Mines Bulletin 144: 111-122, 222, Pl. 41.
 
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