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	1.	No cover image available Porvenir formation (new name)--and other revisions of nomenclature of Mississippian, Pennsylvanian, and lower Permian rocks, southeastern Sangre de Cristo Mountains, New Mexico / by Elmer H. Baltz and Donald A. Myers by Baltz, Elmer Harold, 1927- Myers, Donald A, 1921- [jt. aut] Series: Contributions to stratigraphy \| Geological Survey bulletin ; bul. no.1537-B Material type: Text; Format: print ; Literary form: Not fiction Language: English Publication details: Washington, D.C. : United States Geological Survey, 1984 Availability: Items available for loan: National Library of India (1)Call number: U.S 551.75097895 B 218 p. Place hold Request article Save to lists
	2.	No cover image available Porvenir formation (new name)--and other revisions of nomenclature of Mississippian, Pennsylvanian, and lower Permian rocks, southeastern Sangre de Cristo Mountains, New Mexico / by Elmer H. Baltz and Donald A. Myers by Baltz, Elmer Harold, 1927- Myers, Donald A, 1921- [jt. aut] Series: Contributions to stratigraphy \| Geological Survey bulletin ; bul. no.1537-B Material type: Text; Format: print ; Literary form: Not fiction Language: English Publication details: Washington, D.C. : United States Geological Survey, 1984 Availability: Items available for loan: National Library of India (1)Call number: U.S 551.75097895 B 218 p. Place hold Request article Save to lists

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