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	1.	No cover image available Depositional environments for strata of composite section of Frontier Formation, Madison Range, southwestern Montana / by R.G. Tysdal by Tysdal, Russell G United States. Department of Interior Series: U.S. Geological Survey bulletin ; Bul. no. 1949 Material type: Text; Format: print ; Literary form: Not fiction Language: English Publication details: Washington, D.C. : United States Department of Interior, 1991 Availability: Items available for loan: National Library of India (1)Call number: U.S 551.7709786 T 987 d. Place hold Request article Save to lists
	2.	No cover image available Ammonites and some characteristic bivalves from the Upper Cretaceous Frontier Formation, Natrona County, Wyoming / by William A. Cobban by Coban, William Aubrey, 1916- Series: U.S. Geological Survey bulletin ; no.1917 Material type: Text; Format: print ; Literary form: Not fiction Language: English Publication details: Washington, D.C. : United States Geological Survey, 1990 Availability: Items available for loan: National Library of India (1)Call number: U.S. 564.530978793 Co 633. Place hold Request article Save to lists

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