Bulletin of the American Museum of Natural History, Volume 88: Article 2, pages 53-96, text figures 1-12, plates 3-10 tables 1-6. Studies of the Phytosaurs Machaeroprosopus and Rutiodon by Edwin Harris Colbert. 1947. 43 pp. Paperback in Fine condition. Stiff wrappers with sharp corners. Pages are crisp, clean, and without flaw.