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1. 
Cover image for Extinction events in earth history
2. 
Cover image for Stratigraphic, paleontologic, and paleoenvironmental analysis of the upper cretaceous rocks of Cimarron County, Northwestern Oklahoma
3. 
Cover image for Stratigraphic, paleontologic, and paleoenvironmental analysis of the upper cretaceous rocks, Nwoklahoma
4. 
Cover image for Concepts and methods of biostratigraphy