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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hays, W. M. (Willet Martin), - Boss, Andrew, - Cooper, Thomas P. (Thomas Poe), - Wilson, A. D. (Archie Dell), - Minnesota Agricultural Experiment Station.
    Publication info: Washington, Govt. Print. Off, 1912
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Oswald, Wieland Leo. - Boss, Andrew,
    Publication info: St. Paul, University of Minnesota, 1913-1918
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library