Some Essential Safety Factors in Tunneling (Bureau of Mines Bulletin 439)

by HARRINGTON, D. and S. H. Ash

$25 · Offered by Between the Covers

Washington: U.S. Government Printing Office, 1941. Softcover. First edition. Octavo. 61pp. Heavily illustrated from photographs. Tiny inked number and tinier stain on the front cover near the crown, spine faintly sunned, near fine in stapled wrappers. Issued as Department of the Interior, Bureau of Mines, Bulletin 439. More

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