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	1.	No cover image available Las Animas formation (upper Precambrian) in the subsurface of southeastern Colorado / by Ogden Tweto by Tweto, Ogden, 1912-1983 Series: Contributions to stratigraphy \| Geological Survey bulletin ; 1529-G Material type: Text; Format: print ; Literary form: Not fiction Language: English Publication details: Washington, D.C. : U.S. Govt. Print. Off., 1983 Availability: Items available for loan: National Library of India (1)Call number: U.S 551.715 T 919 l (Bull. no. 1529-G). Place hold Request article Save to lists
	2.	No cover image available Nomenclature of Precambrian rocks in Colorado / by Ogden Tweto by Tweto, Ogden, 1912-1983 Series: Contributions to stratigraphy \| Geological Survey bulletin ; 1422-D Material type: Text; Format: print ; Literary form: Not fiction Language: English Publication details: Washington : United States Government Printing Office, 1977 Availability: Items available for loan: National Library of India (1)Call number: U.S 551.7109788 T 919 n (Bull. no. 1422-D). Place hold Request article Save to lists

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