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照片出處
- Brakefield, Tom. "Bonasa umbellus, ruffed grouse." Dec 1976. CalAcademy, California Academy of Sciences.
- Schmid, Johann C. "You're a grand old bell. 1919." Philadelphia, Pennsylvania, H.A. Weymann & Son, 1919. Historic American Sheet Music, 1850-1920 (from Duke University), Library of Congress.
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