Consists of papers of the Mathews family, a 19th-century English theatrical family whose members performed and wrote for the stage and achieved fame as gifted mimics and comedians. Much of the correspondence in the collection is between the family members. Also included are manuscripts of autobiographies written by both the father and son, as well as some manuscripts of monologues, songs, roles, and music.

John Lehmann was an English author, poet, journalist, editor, and publisher. His papers consist of letters from his literary friends, the correspondence of his family since the nineteenth century, manuscripts of his publications, financial and domestic files, and personal memorabilia.

Consists of correspondence, documents, a diary (1838), genealogies, documents, legal papers, financial records, and printed matter of the Hubbell family of Canandaigua, Ontario County, New York.

Consists of papers of various members of the Howell family of Morris County, New Jersey.

Consists of papers relating to the Cooley family of Alexandria, Hunterdon County, New Jersey.

The Clarke family lived and farmed in the Stony Brook - Quaker Bridge area of Middlesex County, New Jersey, now known as Clarkesville of Mercer County. The collection includes documents of the Clarke family such as deeds, wills, and mortgages of various generations of Clarkes.

Consists of diaries, correspondence, documents, scrapbooks, and printed matter of the Chambers family of Bucks County, Pennsylvania.

The collection consists of the personal and family papers of five members of the Blair and Lee families of Maryland, Washington, D.C., and Virginia -- Francis Preston Blair (1791-1876); his daughter, Elizabeth Blair Lee (1818-1906); her husband, Samuel Phillips Lee (1812-1897); their son, Blair Lee (1857-1944, Princeton Class of 1880); and his cousin, Andrew Alexander Blair (1848-1932) -- reflecting their various political, journalistic, naval, family, business, legal, and domestic interests.

Bernard Flexner, a lawyer, philanthropist and Zionist leader, was an early supporter of the juvenile court movement. Contains the personal papers of Flexner, including diaries and letters to his sister Mary while he served with the American Red Cross Commission to Romania (1917) and as counsel for the Zionist delegation to the Paris Peace Conference (1918-1919); material concerning Albert Einstein, Franklin D. Roosevelt, the Sacco-Vanzetti trial record, and the juvenile court system of the early 1900s; and miscellaneous correspondence.