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1.
Stratigraphy and geologic history of the Montana group and equivalent rocks, Montana, Wyoming and North and South Dakota / by J. R. Gill and W. A. Cobban by Series: Geological Survey professional paper ; no.776
Material type: Text Text; Format: print ; Literary form: Not fiction
Language: English
Publication details: Washington, D.C. : United state government printing office, 1973
Availability: Items available for loan: National Library of India (1)Call number: U.S 551.720978 G 41.

2.
Stratigraphy and composition of the Sharon Springs Member of the Pierre Shale in western Kansas/ by James R. Gill, William A. Cobban, and Leonard G. Schultz by Series: Geological Survey professional paper ; 728
Material type: Text Text; Format: print ; Literary form: Not fiction
Language: English
Publication details: Washington, D.C : United States Government Printing Office, 1972
Availability: Items available for loan: National Library of India (1)Call number: U.S 551.7709781123 G 41(no. 728).

                                                                           
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