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  1. 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.
    Holding Institution: University of Connecticut Libraries (archive.org)
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