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- 68061970 contributor B1871479.
- 68061970 contributor B1871480.
- 68061970 created "1968]".
- 68061970 date "1968".
- 68061970 date "1968]".
- 68061970 dateCopyrighted "1968]".
- 68061970 description "Bibliography: p. 36-38.".
- 68061970 extent "v, 48 p.".
- 68061970 issued "1968".
- 68061970 issued "1968]".
- 68061970 language "eng".
- 68061970 publisher "[Washington, For sale by the Supt. of Docs., U.S. Govt. Print. Off.,".
- 68061970 spatial "United States".
- 68061970 subject "624/.19".
- 68061970 subject "TN23 .U4 no. 644".
- 68061970 subject "Tunneling United States Safety measures.".
- 68061970 title "Tunneling: recommended safety rules, by staff, health and safety activity, Washington, D.C., and Health and Safety District A.".
- 68061970 type "text".