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  1. By: Humphrey, John R. (John Regester), - Nahstoll, G. A. (George Anton),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1917
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Humphrey, John R. (John Regester), - Kerr, W. H. (William Horace),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1916
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Nahstoll, G. A. (George Anton), - Humphrey, John R. (John Regester),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1918
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. By: Newton, Roy Lee, - Humphrey, John R. (John Regester),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1917
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  5. By: Humphrey, John R. (John Regester), - Kerr, W. H. (William Horace),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1915
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  6. By: Humphrey, John R. (John Regester), - Kerr, W. H. (William Horace),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1916
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  7. By: Humphrey, John R. (John Regester), - Kerr, W. H. (William Horace),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1916
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library