Theodore (Teddy) Roosevelt
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The largest trove of T.R. papers is housed at the Library of Congress; some of the material has been digitized.
A complement to the papers housed at the library of Congress, the Theodore Roosevelt Collection at Harvard Univerity's Houghton Library hosts the bulk of T.R.'s family manuscripts.
The bulk of T.R.'s books are now in the public domain. You can read them here.