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  1. By: Thompson, G. E. - United States. Bureau of Plant Industry.
    Publication info: Washington, D.C, United States Department of Agriculture, Bureau of Plant Industry, Forage Crop Investigations, 1913
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Vinall, H. N. (Harry Nelson), - Thompson, G. E. - United States. Bureau of Plant Industry.
    Publication info: Washington, D.C, United States Department of Agriculture, Bureau of Plant Industry, Forage Crop Investigations, 1912
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library