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  1. 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.
    Holding Institution: University of Toronto - Royal Ontario Museum Library & Archives
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