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1981
January January; 166 (1): 1 - 156	February February; 166 (2): 157 - 319	March March; 166 (3): 321 - 468
April April; 166 (4): 469 - 591	May May; 167 (1): 1 - 142	June June; 167 (2): 143 - 299
July July; 167 (3): 301 - 452	September September; 167 (4): 453 - 623	October October; 168 (1): 1 - 142
November November; 168 (2): 143 - 299	December December; 168 (3): 301 - 413