. Der Gesang der Vögel : seine anatomischen und biologischen Grundlagen. Birdsongs; Birds -- Anatomy. ;. 5. Fig. 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 Hacker, Valentin, 1864-1927. Jena : Verlag von Gustav Fischer

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbirdsan, bookyear1900