Biodiversity Heritage Library
By "Twitchell, M. W. 1868-"
The Mesozoic and Cenozoic Echinodermata of the United States / by William Bullock Clark ; and Mayville W. Twitchell.
By: Clark, William Bullock, - Twitchell, M. W.
Publication info: Washington, :Govt. print. off.,1915.
Contributed by: University of Connecticut Libraries (archive.org)