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- catalog contributor b9171653.
- catalog contributor b9171654.
- catalog contributor b9171655.
- catalog created "1941.".
- catalog date "1941".
- catalog date "1941.".
- catalog dateCopyrighted "1941.".
- catalog extent "iv, 61 p. incl. illus., tables.".
- catalog hasFormat "Some essential safety factors in tunneling.".
- catalog isFormatOf "Some essential safety factors in tunneling.".
- catalog isPartOf "Bulletin (United States. Bureau of Mines) ; 439.".
- catalog isPartOf "United States. Bureau of mines. Bulletin 439".
- catalog issued "1941".
- catalog issued "1941.".
- catalog language "eng".
- catalog publisher "Washington, U.S. Govt. print. off.,".
- catalog relation "Some essential safety factors in tunneling.".
- catalog subject "625.13".
- catalog subject "Accidents Prevention.".
- catalog subject "Accidents prevention & control".
- catalog subject "TN23 .U4 no. 439 TN285.H3".
- catalog subject "Tunneling.".
- catalog title "Some essential safety factors in tunneling, by D. Harrington and S. H. Ash.".
- catalog type "text".