. Der Ornithologische Beobachter. Ornithology; Birds. Dr. Hermann Fischer-Sigwart. Beilage zum „Ornithologischen Beobachter", Heft 6, 1921/22. r. »,8asel. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ala, société suisse pour l'étude des oiseaux et leur protection. [Bern? : Ala, Schweizerische Gesellschaft für Vogelkunde und Vogelschutz]

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbirds, bookyear1902