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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Phaff, Herman. - Mrak, E. M. (Emil Marcel),
    Publication info: Berkeley, Calif, University of California, College of Agriculture, Agricultural Experiment Station, 1948
    Holding Institution: University of California, Davis Libraries
  2. By: Mrak, E. M. (Emil Marcel), - Phaff, Herman.
    Publication info: Berkeley, Calif, University of California, College of Agriculture, Agricultural Experiment Station, 1949
    Holding Institution: University of California, Davis Libraries