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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Gregory, Philip Herries.
    Publication info: London, L. Hill, 1961
    Holding Institution: MBLWHOI Library
    Subjects: Air  Air Microbiology  Atmosphere  Microbiology  Pollen  Spores  Spores (Botany)
  2. By: Tyndall, John,
    Publication info: New York, D. Appleton and Company, 1888
    Holding Institution: MBLWHOI Library
    Subjects: Air Microbiology  Communicable Diseases  etiology  History