The first manuscripts collected at Columbia, these 2,350 volumes of manuscript books and bound volumes of letters were classified in the regular classification scheme (Dewey) with the call number preceded by the letter "X". They were cataloged by printed book rules into the main catalog. Cards are found in RBML in the correspondence and manuscript card files, as well as the "X" shelflist. No firther additions to this collection are made since the 1960s.