Chiefly 19th-century New York and New England local history manuscripts and business records, primarily for craftsmen and railroads; papers of children's book writer and illustrator Marcia J. Brown and two original manuscripts by Maud and Miska Petersham; papers of Pulitzer Prize-winning author William Kennedy; papers of Anthony Ashley Cooper, the 19th century social reformer; and papers of Benito Perez Galdos, Gonzalo Torrente Ballester, Evengi Zamyatin, and other writers.