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  1. By: Kirchner, Walter Charles George,
    Publication info: [n.p.], 1898
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    Subjects: Colorado  Florissant  Paleobotany  Tertiary
  2. By: Brues, Charles T. (Charles Thomas),
    Publication info: Cambridge, Mass, The Museum, 1908
    Holding Institution: University of California Libraries
    Subjects: Colorado  Florissant  Hymenoptera, Fossil  Paleontology  Tertiary