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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Slack, Henry James,
    Edition: 2nd ed.
    Publication info: London, Groombridge, 1871
    Holding Institution: NCSU Libraries
    Subjects: England  Freshwater animals  Microscopy  Pond animals  
  2. By: Ash, Edward C. (Edward Cecil),
    Publication info: London, T.C. & E. Jack, [1913]
    Holding Institution: University of Toronto - Gerstein Science Information Centre
    Subjects: Pond animals  Pond ecology