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1981
January January; 31 (1): 1 - 98	February February; 31 (2): 101 - 198	March March; 31 (3): 201 - 293
April April; 31 (4): 299 - 396	May May; 31 (5): 398 - 490	June June; 31 (6): 496 - 594
July July; 32 (1): 1 - 106	August August; 32 (2): 109 - 216	September September; 32 (3): 217 - 320
October October; 32 (4): 325 - 422	November November; 32 (5): 427 - 516	December December; 32 (6): 525 - 621