Hydraulic Method of Mining W. C. Butler, Engraver [in block, l.r.] C. Nahl. [in block, l.l.] Wood engraving; 23 x 18 cm. :19--A

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Hydraulic Method of Mining -- W. C. Butler, Engraver [in block, l.r.] -- C. Nahl. [in block, l.l.] -- Wood engraving; 23 x 18 cm.

UC Berkeley, Bancroft Library