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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Krogh, August,
    Edition: [New ed.]
    Publication info: Philadelphia, University of Pennsylvania press, [1959, c1941]
    Holding Institution: MBLWHOI Library
  2. By: Krogh, August,
    Publication info: London, Longmans, 1916
    Holding Institution: University of Toronto - Gerstein Science Information Centre