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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Ballard, W. S. (William Salisbury), - Volck, W. H. (William Hunter),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1914
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Volck, W. H. (William Hunter),
    Publication info: Berkeley, Calif, University of California, College of Agricluture, Agricultural Experiment Station, [1905]
    Holding Institution: University of California, Davis Libraries