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BROMFIELD, C. S., USGS BULL. 1227. USGS BULL 1353.

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Original EntryBROMFIELD, C. S., USGS BULL. 1227. USGS BULL 1353.
Mindat Ref. ID16295615Long-form Identifiermindat:1:5:16295615:7
GUID0
Full ReferenceBROMFIELD, C. S., USGS BULL. 1227. USGS BULL 1353.
Plain TextBROMFIELD, C. S., USGS BULL. 1227. USGS BULL 1353.

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Butterfly Mine, Ophir Mining District (Iron Springs Mining District), San Miguel County, Colorado, USA

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BROMFIELD, G. S., 1967, USGS BULL. 1227
USGS BULL. 1353 -
Bromfield, Calvin S. & Sgride (1956), Mineral Resources of the San Carlos Indian Reservation, USGS Bull. 1027-N: 635.
Bromfield, Calvin S. & Shride (1956), Mineral resources of the San Carlos Indian Reservation, AZ, USGS Bull. 1027-N: 617.
Bromfield, Calvin S. & Sgride (1956), Mineral Resources of the San Carlos Indian Reservation, USGS Bull. 1027-N: 630, 635.
Bush, Alfred Lerner; Bromfield, C. S.; Pierson, Charles Thomas (1959) Areal geology of the Placerville quadrangle, San Miguel County, Colorado USGS Bull 1072E.
Bromfield, Calvin S. & Shride (1956), Mineral Resources of the San Carlos Indian Reservation, AZ, USGS Bull. 1027-N: 673-676.
Bromfield, Calvin S. & Shride (1956), Mineral resources of the San Carlos Indian Reservation, AZ, USGS Bull. 1027-N: 634-635.
Bromfield, Calvin S. & Shride (1956), Mineral Resources of the San Carlos Indian Reservation, AZ, USGS Bull. 1027-N: 653-654.
Bromfield, C.S. & Shride (1956), Mineral Resources of the San Carlos Indian Reservation, USGS Bull. 1027-N: 637.
Bromfield, Calvin S. & Shride (1956), Mineral Resources of the San Carlos Indian Reservation, AZ, USGS Bull. 1027-N: 649, 673-676.
 
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