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  1. By: Geographical and Geological Survey of the Rocky Mountain Region (U.S.) - Newton, Henry, - Jenney, Walter P, (Walter Proctor.
    Publication info: Washington, Govt. Print. Off, 1880
    Holding Institution: Smithsonian Libraries and Archives
  2. By: Hovey, Edmund Otis, - Newton, Henry, - Whitfield, R. P. (Robert Parr),
    Publication info: 1902
    Holding Institution: American Museum of Natural History Library
  3. By: Newton, Henry, - Jenney, Walter P. (Walter Proctor), - Gray, Asa, - Geographical and Geological Survey of the Rocky Mountain Region (U.S.)
    Publication info: Washington, Govt. Print. Off, 1880
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library