1989
January/February 1989; 51 (1): 1 - 108	March/April 1989; 51 (2): 113 - 221	May/June 1989; 51 (3): 269 - 370
July/August 1989; 51 (4): 373 - 462	September/October 1989; 51 (5): 479 - 593	November/December 1989; 51 (6): 595 - 651