Brief von Charles D. Walcott an Alexander Graham Bell, undatiert
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Brief von Gardiner Greene Hubbard an Alexander Graham Bell, undatiert
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Brief von Edward A. Fay an Alexander Graham Bell, 9. Juli 1872
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Brief von F. B. Perkins an Alexander Graham Bell, 25. Januar 1872
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Zeichnung von Alexander Graham Bell, 1876
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Letter, January 19, 1876 - Alexander Graham Bell family papers
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Clipping, January 16, 1878 - Alexander Graham Bell family papers
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Brief von Mabel Hubbard Bell an Gertrude McCurdy Hubbard, 22. Januar 1...
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Article, October 25, 1879 - Public domain document scan
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Circular, February 27, 1879 - Public domain document scan
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Brief von Mabel Hubbard Bell, 27. Februar 1880
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