Consists of selected correspondence, poetry, photographs, and printed material of and relating to 20th-century American poet Robert Frost.

Consists mainly of correspondence between family members of Arthur L. Frothingham, who was a Princeton professor of archaeology (1886-1905). The collection includes correspondence and family photographs from his father, Arthur L. Frothingham, mother, Jessie Peabody Frothingham, and sister, Jessie Peabody Frothingham. Also present are manuscripts concerning Arthur L. Frothingham's study (ca.1912) on arches in the Roman Empire.

Consists primarily of family correspondence of John Henry Hobart, a bishop of the Protestant Episcopal Church.

Consists primarily of material relating to Ohio farmer Luzern Humphrey's overland journey from Kanesville, Iowa, to the Oregon Territory in 1852, his life there through 1853, and his return to Iowa in 1854, including his journal and 51 letters to his wife in Ohio. Also included are some papers relating to the family of William Miller, the founder of Adventism.

Consists chiefly of letters of the Constitution signer and Philadelphia lawyer Jared Ingersoll to his son Charles while he was a student at the College of New Jersey (now Princeton University).

Consists of correspondence, manuscripts, and documents of members of the Joline family of Princeton, New Jersey.

Consists chiefly of letters and photographs of Arthur Machen, the Welsh-born writer called "the Apostle of Wonder" because of his mastery of the English language and outstanding creation of supernatural fiction.

Consists of works, correspondence, documents, photographs, memorabilia, family papers, scrapbooks, and an autograph book (1880) of Charles Grosvenor Osgood, reflecting his role as one of Woodrow Wilson's original preceptors (1905) and the importance of the preceptorial system at Princeton. The collection contains typed manuscripts of Osgood's lectures on Milton, Spenser, and Samuel Johnson, addresses and note cards, and professional correspondence.

Consists of the personal papers of Ernest Cushing Richardson, librarian of Princeton University Library from 1890 till 1925.

Consists of original letters and transcriptions of additional letters by Edwin Arlington Robinson, American poet and winner of three Pulitzer Prizes.