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1991
January January 5; 128 (1): 3 - 20 January 12; 128 (2): 22 - 44 January 19; 128 (3): 46 - 68 January 26; 128 (4): 70 - 92	February February 2; 128 (5): 98 - 116 February 9; 128 (6): 121 - 140 February 16; 128 (7): 145 - 167 February 23; 128 (8): 175 - 192	March March 2; 128 (9): 199 - 216 March 9; 128 (10): 221 - 240 March 16; 128 (11): 245 - 264 March 23; 128 (12): 270 - 288 March 30; 128 (13): 291 - 312
April April 6; 128 (14): 316 - 340 April 13; 128 (15): 346 - 364 April 20; 128 (16): 370 - 388 April 27; 128 (17): 395 - 412	May May 4; 128 (18): 416 - 436 May 11; 128 (19): 440 - 460 May 18; 128 (20): 466 - 484 May 25; 128 (21): 488 - 507	June June 1; 128 (22): 513 - 532 June 8; 128 (23): 539 - 555 June 15; 128 (24): 558 - 576 June 22; 128 (25): 582 - 600 June 29; 128 (26): 606 - 619
July July 6; 129 (1): 5 - 20 July 13; 129 (2): 25 - 40 July 20; 129 (3): 42 - 60 July 27; 129 (4): 63 - 80	August August 3; 129 (5): 86 - 104 August 10; 129 (6): 109 - 128 August 17; 129 (7): 133 - 152 August 24; 129 (8): 166 - 179 August 31; 129 (9): 182 - 204	September September 7; 129 (10): 209 - 228 September 14; 129 (11): 233 - 252 September 21; 129 (12): 258 - 272 September 28; 129 (13): 279 - 296
October October 5; 129 (14): 304 - 320 October 12; 129 (15): 327 - 344 October 19; 129 (16): 350 - 368 October 26; 129 (17): 370 - 392	November November 2; 129 (18): 398 - 416 November 9; 129 (19): 421 - 436 November 16; 129 (20): 437 - 456 November 23; 129 (21): 457 - 476 November 30; 129 (22): 482 - 496	December December 7; 129 (23): 502 - 516 December 14; 129 (24): 522 - 536 December 21; 129 (25-26): 538 - 560