Safety practices in tunneling operations at the Hetch Hetchy Water-supply Project, City and County of San Francisco, Calif. /
by S.H. Ash and C.R. Rankin.

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Main Author: Ash, S. H. (Simon Harry), 1889-
Related Names: Rankin, Carl R.
United States. Bureau of Mines.
Language(s): English
Published: Washington, D.C. : U.S. Bureau of Mines, 1933.
Subjects: Tunneling > Tunneling / Safety measures.
Hetch Hetchy Reservoir (Calif.)
Physical Description: 15 p. : ill. ; 27 cm.
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