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  1. By: Collins, G. N. (Guy N.),
    Publication info: Washington, Govt. Print. Off, 1905
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Collins, G. N. (Guy N.),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1926
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Cook, O. F. (Orator Fuller), - Collins, G. N. (Guy N.),
    Publication info: Washington, Govt. Print Off, 1903
    Holding Institution: Smithsonian Libraries and Archives
  4. By: Collins, G. N. (Guy N.),
    Publication info: Washington, Govt. print. off, 1913
    Holding Institution: Library of Congress
  5. By: Collins, G. N. (Guy N.),
    Publication info: 1909
    Holding Institution: Library of Congress
  6. By: United States. Bureau of Plant Industry. - Collins, G. N. (Guy N.), - Cook, O. F. (Orator Fuller), - Hastings, Stephen H. (Stephen Harold), - Kellerman, Karl F. - Kempton, J. H. (James Howard),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, Bureau of Plant Industry, 1913
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  7. By: Collins, G. N. (Guy N.),
    Publication info: Washington, Govt. print. off, 1909
    Holding Institution: Library of Congress
  8. By: Collins, G. N. (Guy N.), - Kempton, J. H. (James Howard),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1927
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library