Approximately 12,000 letters to Allan Nevins from various correspondents including James Truslow Adams, Franklin Delano Roosevelt, Harry S. Truman, Willa Cather, Frances Folsom Cleveland, Van Wyck Brooks, Robert Frost, Newton D. Baker, Archibald MacLeish, John D. Rockefeller, Jr., Carl Sandburg, and Henry Wallace; notes and typescripts for Nevins' books including Emergence of Lincoln, The Ordeal of Democracy, Rockefeller, and History and Historians, with notes by editor Ray A. Billington; miscellaneous transcripts, clippings, newspapers, and photographs. Also, autograph letters and manuscripts by presidents, Civil War figures, financiers, politicians, and authors. There are also the Brand Whitlock World War I Diaries and letters to him by such people as Herbert Hoover, Gen. John J. Pershing, and others.

The collection consists of letters from celebrities in various fields, largely addressed to Harry Harkness Flagler. Included are letters of Ambrose Bierce, Thomas A. Edison, Edwin Forrest, Andrew Jackson, Rudyard Kipling, Richard Mansfield, John D. Rockefeller, Franklin D. Roosevelt, John Ruskin, Constantin Stanislavsky, and George Washington. Especially noteworthy are five letters of Charles Dickens, bound together in one volume.

A collection of Franklin Roosevelt letters, manuscripts, and documents including twelve letters written to his mother, Sara Delano Roosevelt, of a personal nature, and 24 letters written to a business associate, John B. Shearer. Signed typescript and mimeographed copies of the first three inaugural addresses are present in the collection as well as a valuable document"Biographical Notes for the Cyclopedia of American Biography" completed in the President's holograph on August 21, 1919. The most charming letter is the one written to his grandfather, Warren Delano, on August 23, 1896, when the President was fourteen years old and traveling through Germany. The books in the collection reflect a wide range of interests including religion, poetry, and history, and all are either signed or inscribed, including the seventeen copies of the President's own writings.

A collection of documents signed by American presidents and bound together in a single volume. Every president, except Eisenhower and Nixon, is represented in the collection. The documents, which are mostly military and naval appointments, certificates of merit, etc. are routine in nature, but an autographed copy (printed) of Franklin Delano Roosevelt's second inaugural address and a signed mimeographed copy of Lyndon Baines Johnson's speech to Congress, November 27, 1963, are also included.

Letters, invitations, documents, page proofs, photographs, lithographs, and books of Rosenman. Letters from political acquaintances including Benjamin Cardozo and W. Averell Harriman, to Rosenman and his wife, Dorothy, one letter by Henry Clay to H. Shaw 23 Sept. 1826 collected by Rosenman, invitations to official social functions, two sets of proofs for political pamphlets written by Rosenman on behalf of New York Governor Alfred E. Smith, photographic and lithographic portraits of political acquaintances signed and inscribed to Rosenman, including those of Dwight D. Eisenhower, W. Averell Harriman, Franklin D. Roosevelt, and Harry S. Truman. Other correspondents include Charles A. Beard, Louis D. Brandeis, Dwight D. Eisenhower, and Wendell Willkie. Also, thirteen books dealing with the Roosevelt administration signed and inscribed by the authors.

Personal letters written by Phoenix to friends and associates, and letters which Phoenix collected as autograph specimens, ranging in date from 1554 (Melanchthon) to 1933 (Franklin D. Roosevelt). Over half of Phoenix's own letters are addressed to Josiah Collins Pumpelly (1839-1920), many others are to Henry Thayer Drowne (1822-1897). The material is dated from various places in the United States and Europe and contains accounts of Phoenix's travels and comments on yachting, books, the theater, and friends. There is a series of Presidential letters ranging from Washington to Franklin D. Roosevelt. Also, an engraved portrait of Phoenix.