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41. Andrew Carnegie letter to Colonel Edward Jay Allen, dated Skibo Castle, Dornoch, Sutherland, 19 June

    ...(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/andrewcarnegiel00carn

42. The beginning of human flight

    ...(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/beginninghumanf00wrig

43. Benjamin Franklin letter to Thomas Darling, dated Philadelphia, 27 March 1747

    ...(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/benjaminfrankli00frana

44. 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

45. Charles Darwin letter to John Stevens Henslow, dated 3 November 1838

    ...(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/charlesdarwinle00darwa

46. Charles E. Duryea letter to George Francis Myers, dated Duryea Power Company, W. Elm and River Stree

    ...(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/charleseduryeal00dury

47. Edward Jenner letter to "Dear Madam," dated Cheltenham, 13 Janunary 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/edwardjennerlet00jenn

48. Eli Whitney letter to Col. George Bomford, dated New Haven, 3 May 1824

    ...(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/eliwhitneylette00whita

49. Ernest Rutherford letter to Rudolf Ladenburg, dated Newnham Cottage, Queen's Road, Cambridge, 3 Sept

    ...(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/ernestrutherfor00ruth

50. George Washington Carver letter to Grady Porter, dated Tuskegee Normal and Industrial Institute, Ala

    ...(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/georgewashingto00carv

51. Guglielmo Marconi letter to Giuseppe Marconi, his father, dated London, 21 March 1896

    ...(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/guglielmomarcon00marca

52. Guglielmo Marconi letter to Giuseppe Marconi, his father, dated London, 8 April 1896

    ...(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/guglielmomarcon00marcc

53. Guglielmo Marconi letter to Giuseppe Marconi, his father, dated 71 Hereford Road, Bayswater W, Londo

    ...(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/guglielmomarcon00marce

54. Guglielmo Marconi letter to Giuseppe Marconi, his father, dated 67 Talbot Road, Westbourne Park, Lon

    ...(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/guglielmomarcon00marci

55. Guglielmo Marconi letter to Giuseppe Marconi, his father, dated The Wireless Telegraph and Signal Co

    ...(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/guglielmomarcon00marck

56. Guglielmo Marconi letter to Lord Aberdeen, dated Marconi Transatlantic Station, Clifden, Connemara,

    ...(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/guglielmomarcon00marcm

57. Henri Becquerel document explaining his polariscope

    ...(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/henribecquereld00becq

58. Henri Becquerel letter to an unidentified correspondent, dated 19 December 1899

    ...(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/henribecquerell00becq

59. Henry and Edsel Ford letter to Albert W. Howard, dated Ford Motor Company, Office of the President,

    ...(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/henryedselfordl00ford

60. Humphry Davy letter to Rev. Dr. Robert Gray, dated 23 Grosvenor Street, London, 13 December 1815

    ...(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/humphrydavylett00davya

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