MATHEMATICS -- WHITEHEAD, A.N. & B. RUSSELL. Principia mathematica. 2nd ed. (Vol. 1 reprinted from 2nd ed.). Cambr., 1927-35. 3 vols. xii, 674; xxxii, 742, (1); viii, 491 pp. Lge-8°. Or. gilt lettered cl. (W. name entry on ti-pp. and free endpapers). - Fine set.