Tunneling: recommended safety rules
By: by staff, health and safety activity, Washington, D.C., and Health and Safety District A.
Contributors: Harrington, D. b. 1878.
Publisher: For sale by the Supt. of Docs., U.S. Govt. Print. Off.
Published: 1968
Place of publication: [Washington
Language: eng
Number of pages: 48
Subjects: Tunneling -- United States -- Safety measures.
Notes: Bibliography: p. 36-38.
Revision of Bulletin 439 issued in 1941 under title: Some essential safety factors in tunneling, by D. Harrington.