New and Little-Known Ammonites from the Upper Cretaceous (Cenomanian and Turonian) of the Western Interior of the United States, 1971, Geological Survey Professional Paper, PP 699 : 24 pages and 18 plates.
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📖 Description
1971 Geological Survey Professional Paper PP 699 : 24 pages and 18 plates. Original publication, not a modern reprint. Softbound, very good to near fine condition