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1.
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 Series: Contributions to stratigraphy | Geological Survey bulletin ; bul. no.1537-B
Material type: Text 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.

2.
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 Series: Contributions to stratigraphy | Geological Survey bulletin ; bul. no.1537-B
Material type: Text 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.

3.
Changes in nomenclature of upper Precambrian to lower Paleozoic(?) formations in the Natick quadrangle, eastern Massachusetts, and their tentative correlations with rocks in Rhode Island and Connecticut / by Arthur E. Nelson ; prepared in cooperation with the Commonwealth of Massachusetts, Dept. of Public Works by Series: Geological Survey bulletin ; 1395-E
Material type: Text Text; Format: print ; Literary form: Not fiction
Language: English
Publication details: Washington, D.C. : United States Government Printing Office, 1974
Availability: Items available for loan: National Library of India (1)Call number: U.S 551.71097444 N 331 c (Bul. no. 1395).

                                                                           
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