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1968
January January; 50 (1): 1 - 176	February February; 50 (2): 177 - 336	March March; 50 (3): 337 - 497
April April; 51 (1): 1 - 158 April; 51 (2): 159 - 312	May May; 51 (3): 313 - 465	June June; 52 (1): 1 - 160
July July; 52 (2): 161 - 317	August August; 52 (3): 319 - 471 August; 53 (1): 1 - 146	September September; 53 (2): 147 - 289
October October; 53 (3): 290 - 431	November November; 54 (1): 1 - 160	December December; 54 (2): 161 - 317 December; 54 (3): 319 - 475