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  1. By: Phillips, W J - Poos, F W
    Type: Article
    In: The Kansas University science bulletin
    Volume: 14
    Date: 1922-10
    Page Range: 349--359
    Publication Info: Lawrence, Kan, The University, 1902-1924
  2. By: Poos, F W
    Type: Article
    In: Journal of the Washington Academy of Sciences
    Volume: 20
    Date: 1930
    Page Range: 116--117
    Publication Info: Washington [etc Washington Academy of Sciences]