Letters of Theodore Roosevelt torrent

The Letters of Theodore Roosevelt, volumes 1-8, edited by Elting E. Morison, published by Harvard.
The Letters of Archie Butt and Taft & Roosevelt, volumes 1-2. Archie Butt was the military aide to Roosevelt and Taft, and was a trusted insider who wrote indiscreet letters about the private goings-on in Washington. An essential source