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Geology of the Western Part of the Harold D. Roberts Tunnel, Colorado (Stations 0+00 to 690+00)
Ernest Eugene WahlstromCharles Sherwood RobinsonV. Quentin Hornback
出版U.S. Government Printing Office, 1981
URLhttp://books.google.com.hk/books?id=yh5QEl3z2UMC&hl=&source=gbs_api
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註釋A description of the geology of and engineering practices used in the western part of the tunnel.