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graphic map, bird, liberty bell and seal of Pennsylvania

照片出處

  1. Brakefield, Tom. "Bonasa umbellus, ruffed grouse." Dec 1976. CalAcademy, California Academy of Sciences.
  2. 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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