Papers of the New York State Governor, 1901-1904. Both incoming and outgoing correspondence, three items of which concern the selection of Ray Brook as the proposed site of the State Hospital for consumptives. Correspondence with Horatio Collins King, Anson G. McCook, John G. McCullough, Nathan L. Miller, Henry Codman Potter, and others.

Papers of the American lawyer and politician. U.S. Senator from New York; President of the New York Central Railroad. Outgoing business and personal correspondence. The correspondence also contains items of a more personal nature, including acceptances and refusals of speaking invitations, requests for meetings, arrangements for social engagements, and personal notes. There are also a number of items associated with Depew's retirement years during which he was frequently approached for reminiscences about various individuals.

Papers of the American lawyer, politician, U.S. Secretary of War under President McKinley, U.S. Secretary of State under Theodore Roosevelt, following the death of John Hay, and United States Senator from New York. Letters, 125 of which are outgoing, which include discussions concerning national and state Republican Party politics. Several letters are responses to speaking and/or dinner invitations as well as recommendations for various appointments. Correspondents include Cephas Brainerd, Henry Billings Brown, Charles Butler, Julius Chambers, Henry J. Cookinham, William E. Curtis, Charles B. Elliott, Robert Ely, John H. Finley, Henry W. Fishel, Jacob Gallinger, Paul Hickok, Frank Wayland Higgins, Willis Johnson, Adrian Joline, John Knox, Samuel Koenig, Chester Lord, Isabel Lord, William McAdoo, Richard McCurdy, Martin McMahon, Charles Miller, Benjamin B. Odell, William C. Osborn, Ellis Robb, Arthur Saunders, and others.