Papers of a Kingston, New York family include correspondence (1740-1930); account books (1768-1770); a daybook (1758-1779); ledgers (1776, 1791-1808); journals, diaries, family Bibles, legal papers (1753-1804), and memorabilia. The bulk of the collection consists of business records of Cornelius Wynkoop and his sons, Cornelius C. Wynkoop and John C. Wynkoop.

Business files (minutes, financial records, hearing records, circuit records, school and missionary society records of individual churches of the Conference); correspondence; memorabilia; and printed material.

Papers of the American educator, author. Yefroikin also used the name S. Efron. Collection includes correspondence, 1912-1966; memorabilia, 1902-1968; and manuscripts, 1920-1968, relating to Yefroikin's writings and to Jewish secular education, particularly the Workmen's Circle schools. Correspondents include Chaim Grade and Melech Ravitch.