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  1. By: Scott, W. M. (William Moore), - Rorer, James Birch, - United States. Bureau of Plant Industry.
    Publication info: Washington, D.C, G.P.O, 1909
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Apple blotch  Apples  Diseases and pests
  2. By: Roberts, John W. (John William),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1917
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Apple blotch  Apples  Diseases and pests  
  3. By: Gunderson, A. J. (Alfred Joseph),
    Publication info: Urbana, Ill, University of Illinois Agricultural Experiment Station, 1919
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Apple blotch  Apples  Diseases and pests  
  4. By: Guba, Emil Frederick,
    Publication info: Urbana, Ill, University of Illinois Agricultural Experiment Station, 1925
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Apple blotch  Apples  Diseases and pests