Ernst, C.H.Barbour, R.W.2010-02-152010-02-151972http://hdl.handle.net/1969.3/22932347 p.This is an excellent guide to the turtles of the United States including detailed descriptions, distribution maps, identification keys and photographs, many in color.turtlesidentification keysecological distributionreptilesgeographical distributiontaxonomyBook