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1981
January January; 50 (1): 1 - 228	February February; 50 (2): 229 - 464	March March; 50 (3): 469 - 691
April April; 50 (4): 693 - 915	May May; 50 (5): 917 - 1114	June June; 50 (6): 1115 - 1382
July July; 51 (1): 1 - 242	August August; 51 (2): 243 - 537	September September; 51 (3): 541 - 782
October October; 51 (4): 783 - 1056	November November; 51 (5): 1057 - 1366	December December; 51 (6): 1367 - 1679