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	1.	No cover image available Geology of the Western part of the Harold D. Roberts Tunnel, Colorado (stations 0+00 to 690+00) / by Ernest E. Wahlstrom, Charles S. Robinson and Quentin Hornback by Wahlstrom, Ernest E Robinson, Charles S [jt. aut] Hornback, Quentin [jt. aut] United States. Department of Interior Series: Geological Survey prfessional paper ; 831-C Material type: Text; Format: print ; Literary form: Not fiction Language: English Publication details: Washington, D.C. : U.S. Department of Interior, 1981 Availability: Items available for loan: National Library of India (1)Call number: U.S 557.880223 W 11. Place hold Request article Save to lists
	2.	No cover image available Geology of the Western part of the Harold D. Roberts Tunnel, Colorado (stations 0+00 to 690+00) / by Ernest E. Wahlstrom, Charles S. Robinson and Quentin Hornback by Wahlstrom, Ernest E Robinson, Charles S [jt. aut] Hornback, Quentin [jt. aut] United States. Department of Interior Series: Geological Survey prfessional paper ; 831-C Material type: Text; Format: print ; Literary form: Not fiction Language: English Publication details: Washington, D.C. : U.S. Department of Interior, 1981 Availability: Items available for loan: National Library of India (1)Call number: U.S 557.880223 W 11. Place hold Request article Save to lists

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