Johnson, Joseph Colin Francis (1897) Getting Gold: A Practical Treatise for Prospectors, Miners, and Students Lippincott, Philadelphia, Pennsylvania, page 15, OCLC5164023
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Johnson, Joseph Colin Francis (1897) Getting Gold: A Practical Treatise for Prospectors, Miners, and Students Lippincott, Philadelphia, Pennsylvania, page 15, OCLC5164023