v.13 (1970) - Check-list of birds of the world - Biodiversity Heritage Library

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Agency (NPS) History

Watch The Swamp, American Experience, Official Site

v.13 (1970) - Check-list of birds of the world - Biodiversity Heritage Library

Available as a PDF download - Gibraltar Ornithological & Natural

v.3 (1937) - Check-list of birds of the world - Biodiversity Heritage Library

Bibliography - Darwin's Fishes

NPS Centennial: 1930's Expansion

Animal Spirits

Birds of Iran - An annotated checklist of the species and subspecies

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