books.google.ca - "This volume includes detailed accounts of the morphology and distribution of the fossil snakes of North America and also remarks on their evolutionary, zoogeographic, and paleoecological patterns. The heart of the book consists of detailed systematic accounts of the known fossil snakes of North America...http://books.google.ca/books/about/Fossil_snakes_of_North_America.html?id=appSZ6HmJtMC&utm_source=gb-gplus-shareFossil snakes of North America
