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1981
January January; 67 (1): 1 - 192	February February; 67 (2): 193 - 387	March March; 67 (3): 389 - 597
April April; 67 (4): 599 - 874	May May; 67 (5): 875 - 1064	June June; 67 (6): 1065 - 1266
July July; 68 (1): 1 - 265	August August; 68 (2): 267 - 519	September September; 68 (3): 521 - 788
October October; 68 (4): 789 - 984	November November; 68 (5): 985 - 1210	December December; 68 (6): 1211 - 1507