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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Petersen, Niels Frederick,
    Edition: 2d ed.
    Publication info: Plainview, Neb, [c1912]
    Holding Institution: Cornell University Library
  2. By: Petersen, Niels Frederick,
    Publication info: Lincoln, Neb, Printed by State Printing Co, 1912
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
  3. By: Petersen, Niels Frederick,
    Edition: 3rd ed.
    Publication info: Plainview, Neb, 1923
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library