Correspondence, incoming and outgoing (1856-1967); legal and financial records; memorabilia, including address books, clippings, genealogical records, and photographs; and writings, mostly of Roger Burlingame, including manuscript and/or published articles, books, book reviews, diaries, poems, short stories, and speeches. Family members represented include Anson Burlingame (1820-1870), a politician and diplomat; Edward L. Burlingame (1848-1922), author and editor; William Roger Burlingame (1889-1967), author, biographer, and novelist; and his wife, Angeline Whiton (d. 1967), a literary agent, known professionally as Ann Watkins. Notable correspondents include authors, poets, artists, etc.

Papers of the American librarian, periodical editor. Collection includes autographed letters, signed documents, postcards, and a drawing; individuals represented include scholars, politicians, diplomats, social reformers, authors, and more. Includes letters collected by Rider as well as his own correspondence.

Letter from the American historian to a Dr. Lieber, mentioning a "Lexicon" and the willingness of Judge Story and Mr. Everett to contribute to it.

Letters from printer and publisher John Mennons of Greenock, Scotland, to James Lawson of New York, regarding Mennon's publication of American literature in Scotland.

Papers of the American author, dramatist, novelist, poet, and short story writer. Collection includes typescript and holograph writings, including book manuscripts, essays, plays, poems, short stories, and notebooks. Also, some family material, such as writings, clippings, memorabilia, a scrapbook, and correspondence, including letters from Theodore Roosevelt to Judge and Mrs. Andrews.

Collection of printed engravings, bank drafts, receipts, correspondence, newspapers, and road commissions from the Revolutionary War period (1775-1783) and beyond focusing on New York State.