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Robert Fulton letter to Robert R. Livingston, dated New York, 29 August 1807
...(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/robertfultonlet00fulta
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William Crookes letter to Douglas Sladen, dated 7 Kensington Park Gardens, W., London, 5 February 19
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https://library.si.edu/digital-library/book/williamcrookesl00crooa
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Marie Curie letter to the director of Independant, dated École municipale de physique & de chimie i
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https://library.si.edu/digital-library/book/mariecurielette00curi
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Marie Curie letter dated Faculté des sciences de Paris, Institut du radium, Laboratoire Curie, 1, R
...(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/mariecurielette00curia