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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Nichols, Paul Frothingham,
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1925
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Nichols, Paul Frothingham, - Christie, A. W. (Arthur William),
    Publication info: Berkeley, Cal, Agricultural Experiment Station, 1930
    Holding Institution: University of California, Davis Libraries
  3. By: Nichols, Paul Frothingham,
    Publication info: Berkeley, Calif, College of Agriculture, University of California, 1933
    Holding Institution: University of California, Davis Libraries