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Start Over You searched for: Subjects Ventilation Remove constraint Subjects: Ventilation Authors Billings, John S. (John Shaw), 1838-1913, author Remove constraint Authors: Billings, John S. (John Shaw), 1838-1913, author

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1. The composition of expired air and its effects upon animal life: abstract of a report on the results of an investigation made for the Smithsonian Institution under the provisions of the Hodgkins fund