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Last edited by WorkBot
March 17, 2010 | History

Tunneling: recommended safety rules (revision of Bulletin 439). 1 edition

Tunneling
United States. Bureau of Mines ...

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Tunneling
recommended safety rules (revision of Bulletin 439).

Published 1968 by U.S.G.P.O. in Washington .
Written in English.

Edition Notes

Series
Bulletin -- 644

ID Numbers

Open Library
OL21051509M

History Created December 9, 2009 · 3 revisions Download catalog record: RDF / JSON

March 17, 2010 Edited by WorkBot update details
January 30, 2010 Edited by WorkBot add more information to works
December 9, 2009 Created by WorkBot add works page