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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Warren, Joseph Allen. - United States. Bureau of Plant Industry.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, Bureau of Plant Industry, 1910
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Warren, Joseph Allen.
    Publication info: Washington, Govt. print. off, 1911
    Holding Institution: Library of Congress
  3. By: Warren, Joseph Allen. - United States. Department of Agriculture. - United States. Bureau of Plant Industry.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, Bureau of Plant Industry, 1909
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library