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  1. By: Westergren, A. M.,
    Publication info: Cambridge, Printed for the Museum, 1911
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  2. By: Spångberg, Jacob, - Westergren, A. M.,
    Publication info: Stockholm, P.A. Norstedt & So̊ner, 1878,
    Holding Institution: University Library, University of Illinois Urbana Champaign
  1. By: Westergren, A. M.,
    Type: Issue
    In: Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass
    Volume: v.39
    Issue: 2
    Date: 1911
    Page Range: 35-68, plus 31 plates
    Publication Info: Cambridge [Mass.] The Museum 1876-1940