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EM 1110-2-2901 Tunnels and Shafts in Rock | Rock (Geology) | Minerals

CECW-EG Engineer Manual 1110-2-2901 Department of the Army EM 1110-2-2901 30 May 97 U.S. Army Corps of Engineers Washington, DC 20314-1000 Engineering and Design TUNNELS AND SHAFTS IN ROCK Distribution Restriction Statement Approved for ...

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