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1968
January January; 5 (1): 1 - 92	February February; 5 (2): 183 - 188	March March; 5 (3): 195 - 288
April April; 5 (4): 289 - 378	May May; 5 (5): 383 - 480	June June; 5 (6): 481 - 568
July July; 6 (1): 1 - 95	August August; 6 (2): 119 - 198	September September; 6 (3): 199 - 317
October October; 6 (4): 321 - 415	November November; 6 (5): 417 - 505	December December; 6 (6): 513 - 608