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Pickard, Byron O., 1882-: Precautions to be observed in entering abandoned exploratory shafts and pits (U.S. Dept. of the Interior, Bureau of Mines, 1921), also by United States Bureau of Mines (page images at HathiTrust)You requested books by authors starting with "Pickard, Byron O.", and with titles starting with "Precautions to be observed in entering abandoned exploratory shafts and pits". (Exclude extended shelves)
Pickard, Byron O., 1882-: Precautions to be observed in entering abandoned exploratory shafts and pits (U.S. Dept. of the Interior, Bureau of Mines, 1921), also by United States Bureau of Mines (page images at HathiTrust)1 item was found.
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