Williston S. W. 1890b. A new plesiosaur from the Niobrara Cretaceous of Kansas. Transactions of the Annual Meetings of the Kansas Academy of Science, 12, 174–178.
Williston S. W. 1890b. A new plesiosaur from the Niobrara Cretaceous of Kansas. Transactions of the Annual Meetings of the Kansas Academy of Science, 12, 174–178.