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  1. Graptolites of New York / by Rudolf Ruedemann.
    By: Ruedemann, Rudolf,
    Publication info: Albany :New York State Education Dept.,1904-1908.
    Contributed by: Gerstein - University of Toronto (
    Subjects: Graptolites  New York (State)  Paleontology  
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  2. Llandoverian graptolites of the northern Canadian Cordillera : Petalograptus, Cephalograptus, Rhaphidograptus, Dimorphograptus, Retiolitidae, and Monograptidae /
    By: Lenz, Alfred C.,
    Publication info: Toronto :Royal Ontario Museum,1982.
    Contributed by: ROM - University of Toronto (
    Subjects: Graptolites  Northwest Territories  Paleontology  Silurian  Yukon Territory  
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