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  1. By: Ayers, S. Henry (Samuel Henry), - Johnson, W. T. (William Trimble)
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1915
    Holding Institution: Multiple institutions
  2. By: Ayers, S. Henry (Samuel Henry), - Johnson, W. T. (William Trimble)
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1915
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Ayers, S. Henry (Samuel Henry), - Bowen, John T. (John Thomas), - Johnson, W. T. (William Trimble)
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1916
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. By: Ayers, S. Henry (Samuel Henry), - Johnson, W. T. (William Trimble)
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1917
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  5. By: Ayers, S. Henry (Samuel Henry), - Johnson, W. T. (William Trimble)
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1915
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  6. By: Ayers, S. Henry (Samuel Henry), - Johnson, W. T. (William Trimble) - Rupp, Philip,
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1919
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library