http://lcweb2.loc.gov/ammem/mcchtml/corhome.html

In honor of the centennial of the Library of Congress’s Manuscript Division, its staff has selected more than 90 original documents for display on this site. The documents span four centuries and include the very first telegraph message, written in Samuel Morse’s own handwriting and sent on May 24, 1844; Alexander Bell’s initial sketches for the design of the telephone; and a poem written by Helen Keller at age 13. Documents are grouped by categories such as “The Presidency,” “Military Affairs,” and “Arts and Literature,” and you can also browse them chronologically or perform keyword searches.