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Charles Babbage letter to Sir John Lubbock, dated 22 August 1833
...(CC0 1.0) This content is in the public domain (free of copyright restrictions). You can copy, modify, and distribute this...
https://library.si.edu/digital-library/book/charlesbabbagel00babb
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Charles Darwin letter to John Stevens Henslow, dated 3 November 1838
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https://library.si.edu/digital-library/book/charlesdarwinle00darwa
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Charles Babbage letter to Mr. Rogers [possibly English poet Samuel Rogers], dated Dorset Street, 10
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https://library.si.edu/digital-library/book/charlesbabbagel00babba
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Charles Wheatstone letter to "My dear Ward," dated 19. Park Crescent, Portland Place N.W., 13 Octobe
...(CC0 1.0) This content is in the public domain (free of copyright restrictions). You can copy, modify, and distribute this...
https://library.si.edu/digital-library/book/charleswheatsto00whea