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1991
January January 1991 53 (1): 1 - 193, S189 - S396	February February 1991 53 (2): 397 - 580	March March 1991 53 (3): 1 - 801
April April 1991 53 (4): 803 - 1009, S989 - S1086	May May 1991 53 (5): 1087 - 1336	June June 1991 53 (6): 1337 - 1506, S1507 - S1651
July July 1991 54 (1): 1 - 176, S177 - S290	August August 1991 54 (2): 291 - 434	September September 1991 54 (3): 435 - 614
October October 1991 54 (4): 615 - 771	November November 1991 54 (5): 773 - 956	December December 1991 54 (6): 957 - 1118, S1113 - S1327