The Completion of the Cambridge Ancient History The Cambridge Ancient History. Vol. xii: The Imperial Crisis and Recovery, A.D. 193–324. Edited by S. A. Cook, F. E. Adcock, M. P. Charlesworth, N. H. Baynes. Pp. xxvii+ 849; maps, plans, and tables. Cambridge: University Press, 1939. Cloth, 35s.