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1981
January January; 61 (1): 7 - 51	February February; 61 (2): 177 - 227	March March; 61 (3): 327 - 408
April April; 61 (4): 479 - 561	May May; 61 (5): 651 - 793	June June; 61 (6): 873 - 927
July July; 61 (7): 1011 - 1063	August August; 61 (8): 1147 - 1200	September September; 61 (9): 1259 - 1292
October October; 61 (10): 1411 - 1494	November November; 61 (11): 1575 - 1612	December December; 61 (12): 1709 - 1835