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  1. By: Hahn, Richard
    Type: Article
    In: Animal keepers' forum
    Volume: 38
    Issue: 4
    Date: 2011-04
    Page Range: 170--171
    Publication Info: Topeka, Kan, American Association of Zoo Keepers,
  2. By: Hahn, Richard
    Type: Article
    In: Animal keepers' forum
    Volume: 38
    Issue: 12
    Date: 2011-12
    Page Range: 609--609
    Publication Info: Topeka, Kan, American Association of Zoo Keepers,