Fifty Years of Communism in Russia. Edited, with an introduction, by Milorad M. Drachkovitch. Hoover Institution Publication, no. 77. University Park and London: Pennsylvania State University Press, 1968. xi, 316 pp. $7.50. - The Comintern: Historical Highlights: Essays, Recollections, Documents. Edited by Milorad M. Drachkovitch and Branko Lazitch. Hoover Institution Publication. New York and Washington: Frederick A. Praeger. London: Pall Mall Press, 1966. xv, 430 pp. $10.00. - Fifty Years of Communism: Theory and Practice, 1917-1967. By G. F. Hudson. New York: Basic Books, Inc., 1968. vii, 234 pp. $5.95. - The Soviet Union: A Half-Century of Communism. Edited by Kurt London. Baltimore: The Johns Hopkins Press, 1968. Published in cooperation with the Institute for Sino-Soviet Studies, The George Washington University, xiv, 493 pp. $12.00, cloth. $2.95, paper. - Russia 1917-1964: A History of Modern Russia from the 1917 Revolution to the Fall of Khrushchev. By J. N. Weshvood. New York and Evanston: Harper & Row, 1966. 208 pp. $4.95.