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  1. By: United States. Bureau of Plant Industry. - Knapp, Seaman Asahel,
    Publication info: Washington,1905.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: United States. Bureau of Plant Industry. Farmers' Cooperative Demonstration Work. - Knapp, Seaman Asahel,
    Edition: Rev. ed.
    Publication info: Washington,1911.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library