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Documents from the Roland Mulchay mining collection. Description: Nacozari district, DDH Maps Guadulpe claim.
Documents from the Roland Mulchay mining collection. Description: Gravity survey by L.R. Denham, 1966, geologic appraisal re zinc & lead, 1956, recon. by T.D. Dimmick, 1960, report by Wilson, 1961.
Kelsey Boltz mining collection: South Dakota - Pennington County, Cochrane Mine, Rochford, S. Dakota
Documents from the Kelsey Boltz mining collection.
Documents from the Roland Mulchay mining collection. Description: San Jorge, Mendoza, DDH logs and maps..
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