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1968
January January; 194 (1): 1 - 288 January; 194 (Suppl): 1P - 96P January; 195 (Suppl): 1P - 36P January; 196 (Suppl): 1P - 140P January; 197 (Suppl): 1P - 88P January; 198 (Suppl): 1P - 121P	February February; 194 (2): 289 - 572 February; 194 (3): 573 - 825	March March; 195 (1): 1 - 251 March; 195 (2): 253 - 503
April April; 195 (3): 505 - 759	May May; 196 (1): 1 - 253 May; 196 (2): 255 - 505	June June; 196 (3): 507 - 759
July July; 197 (1): 1 - 253 July; 197 (2): 255 - 509	August August; 197 (3): 511 - 734	September September; 198 (1): 1 - 250 September; 198 (2): 251 - 503
October October; 198 (3): 505 - i2	November November; 199 (1): 1 - 240	December December; 199 (2): 241 - 494 December; 199 (3): 495 - 749