All Subjects
      All Types

        Info

        Grades

        1-12

        Permitted Use

        Stream, Download, Share, and Modify


        2 Favorites
        12 Views

        Adding Up | History of the Computer

        circa 1931: Girls using counting and adding machines. (Photo by Hulton Archive/Getty Images)

        You must be logged in to use this feature

        Need an account?
        Register Now