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1990
January January 1990 51 (1): 1 - 130	February February 1990 51 (2): 139 - 319	March March 1990 51 (3): 321 - 528
April April 1990 51 (4): 531 - 707	May May 1990 51 (5): 711 - 893, S897 - S952	June June 1990 51 (6): 953 - 1119
July July 1990 52 (1): 1 - 181	August August 1990 52 (2): 183 - 403	September September 1990 52 (3): 405 - 580
October October 1990 52 (4): 581 - 765	November November 1990 52 (5): 767 - 951	December December 1990 52 (6): 953 - 1138