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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Robinson, T. Ralph. - United States. Bureau of Plant Industry.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, Bureau of Plant Industry, 1908
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Robinson, T. Ralph. - Salisbury, Morse, - United States. Bureau of Plant Industry.
    Publication info: [United States], [Bureau of Plant Industry], August 26, 1931
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library