GUIDE: Spear, Dorothy. Bibliography of American directories through 1860. Z5771.S7 City directories of the United States, 1860-1901 : guide to the microfilm collection. E-8735. The Center has three segments of this series: I, city directories on microfiche through 1860, based on the Spear bibliography, comprised of 6,298 fiche; II, directories from 1861-1881, on 372 reels of microfilm; III, directories from 1882-1901, in 746 reels of microfilm.