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1968
January January; 159 (1): 1 - 242	February February; 159 (2): 243 - 440	March March; 160 (1): 1 - 248
April April; 160 (2): 249 - 414	May May; 161 (1): 1 - 190	June June; 161 (2): 191 - 396
July July; 162 (1): 1 - 202	August August; 162 (2): 203 - 359	September September; 163 (1): 1 - 256
October October; 163 (2): 257 - 474	November November; 164 (1): 1 - 252	December December; 164 (2): 253 - 441