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Greetings everyone. I'm looking for a 1981 paper by Bruce J. Welton and John M. Alderson entitled, "A Preliminary Note on the Late Cretaceous Sharks of the Chatsworth Formation at Dayton Canyon, Simi Hills, Los Angeles County, California." I think it appeared in a field trip guidebook put out by the Pacific Section, Society of Economic Paleontologists and Mineralogists (SEPM). Thanks!