1973
January/February 1973; 35 (1): 1 - 90	March/April 1973; 35 (2): 91 - 182	May/June 1973; 35 (3): 183 - 274
July/August 1973; 35 (4): 274 - 365	September/October 1973; 35 (5): 367 - 459	November/December 1973; 35 (6): 461 - 549