Biodiversity Heritage Library · page-8744972
Der Ornithologische Beobachter — Illustration, Page 252
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BHL classifies this scanned page as Illustration. Publication: Der Ornithologische Beobachter. Publication creators (not identified as the page's illustrator): Ala, Schweizerische Gesellschaft für Vogelkunde und Vogelschutz.. Contributing institutions: American Museum of Natural History Library. Bibliographic metadata supplied by BHL under CC0; image rights are separate.
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1902. Der Ornithologische Beobachter — Illustration, Page 252. https://www.biodiversitylibrary.org/page/8744972
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