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1977
January January; 49 (1): 1 - 128	February February; 49 (2): 129 - 256	March March; 49 (3): 257 - 384
April April; 49 (4): 385 - 512	May May; 49 (5): 513 - 640	June June; 49 (6): 641 - 736
July July; 50 (1): 1 - 121 July; 50 (1_Supplement): 2s - 84s	August August; 50 (2): 129 - 254	September September; 50 (3): 255 - 382
October October; 50 (4): 383 - 510	November November; 50 (5): 511 - 638	December December; 50 (6): 639 - 734