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  1. By: Claassen, P. W. (Peter Walter), - Beamer, R. H. (Raymond Hill),
    Publication info: Topeka, University of Kansas, 1917
    Holding Institution: Smithsonian Libraries and Archives
  2. By: Claassen, P. W. (Peter Walter), - Needham, James G. (James George),
    Publication info: Ithaca, N.Y, The Comstock publishing co, [c1922]
    Holding Institution: Library of Congress
  3. By: Needham, James G. (James George), - Claassen, P. W. (Peter Walter),
    Publication info: LaFayette, Ind, 1925
    Holding Institution: MBLWHOI Library
  4. By: Claassen, P. W. (Peter Walter),
    Publication info: Springfield, Ill, Pub. for the Thomas Say Foundation by C.C. Thomas, 1931
    Holding Institution: University Library, University of Illinois Urbana Champaign
  1. By: Claassen, P. W. (Peter Walter),
    Type: Article
    In: Annals of the Entomological Society of America
    Volume: 12
    Date: 1919
    Page Range: 95--100
    Publication Info: [College Park, Md., etc.], Entomological Society of America,
  2. By: Claassen, P. W. (Peter Walter),
    Type: Article
    In: Annals of the Entomological Society of America
    Volume: 11
    Date: 1918
    Page Range: 9--16
    Publication Info: [College Park, Md., etc.], Entomological Society of America,