42-56, April 1980 42-55, February 1980 42-54, December 1979 42-53, October 1979 42-52, August 1979 42-51, June 1979 42-50, April 1979 42-49, February 1979 42-48, December 1978 42-47, October 1978 42-46, August 1978 42-45, June 1978 42-44, April 1978 42-43, February 1978 42-42, December 1977 42-41, October 1977 42-40, August 1977 42-39, June 1977

42-38, April 1977 42-37, February 1977 42-36, December 1976 42-35, October 1976 42-34, August 1976 42-33, June 1976 42-32, April 1976 42-31, February 1976 42-30, December 1975 42-29, October 1975 42-28, August 1975 42-27, June 1975 42-26, April 1975 42-25, February 1975 42-24, December 1974 42-23, October 1974 42-22, August 1974 42-21, June 1974 42-20, April 1974

32-1526, vol. XIX, February 1974 32-1526, vol. XVIII, December 1973 32-1526, vol. XVII, October 1973 32-1526, vol. XVI, August 1973 32-1526, vol. XV, June 1973 32-1526, vol. XIV, April 1973 32-1526, vol. XIII, February 1973 32-1526, vol. XII, December 1972 32-1526, vol. XI, October 1972 32-1526, vol. X, August 1972 32-1526, vol. IX, June 1972 32-1526, vol. VIII, April 1972 32-1526, vol. VII, February 1972 32-1526, vol. VI, December 1971 32-1526, vol. V, October 1971 32-1526, vol. IV, August 1971 32-1526, vol. III, June 1971 32-1526, vol. II, April 1971 32-1526, vol. I, February 1971