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Offprint from the Transactions of the American Institute of Mining Engineers”, 1893. 55 pp.  (8vo) disbound.

Inscribed on front cover, “Mr. H.J. Cantwell, from the Author. Out of Print”.  In 1875, Jenney led a scientific expedition, sponsored by the US Geological Survey and guarded by a military force under Colonel Richard Dodge, to map the Black Hills of South Dakota. Confirming General George Custer’s finding of gold in the territory, the expedition accelerated the Black Hills Gold Rush and led, the following year, to war with the Sioux and Custer’s memorable defeat at the Little Big Horn.