Xiphactinus vetusand the distribution ofXiphactinusspecies in the eastern United States Schwimmer, David R. ; Stewart, J. D. ; Williams, G. Dent Abstract Publication: Journal of Vertebrate Paleontology Pub Date: September 1997 DOI: 10.1080/02724634.1997.10011007 Bibcode: 1997JVPal..17..610S