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  1. By: Ecological Society of America. Committee on the Preservation of Natural Conditions. - Shelford, Victor E. (Victor Ernest),
    Publication info: Baltimore,Williams & Wilkins,1926.
    Holding Institution: Prelinger Library (archive.org)
  2. By: Ecological Society of America. Committee on the Preservation of Natural Conditions. - Shelford, Victor E. (Victor Ernest),
    Publication info: Baltimore,Williams & Wilkins,1926.
    Holding Institution: MBLWHOI Library