David, L.R., 1944, A Permian shark from the Grand Canyon: Journal of Paleontology, v. 18, p. 90-93. Authors David, L.R. Publication Date 1944 Citation Journal of Paleontology, v. 18, p. 90-93. State AZ Province CP TR County CN MO Keywords Vertebrate More Keywords Vertebrate, AzGeoBib RefNum 2433