Some essential safety factors in tunneling / by D. Harrington and S.H. Ash.
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| Main Authors: | , |
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| Corporate Author: | |
| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington :
U.S. Govt. Print. Off,
1941.
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| Series: | Bulletin (United States. Bureau of Mines) ;
439. |
| Subjects: |
| Item Description: | No.430-439 issued bound together. At head of title: United States Dept. of the interior, Harold L. Ickes, secretary. Bureau of mines, R.R. Sayers, director. |
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| Physical Description: | iv, 61 pages including illustrations, tables. ; 23 cm. |
| Action Note: | committed to retain |