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1968
January January; 25 (1): 5 - 45	February February; 25 (2): 59 - 93	March March; 25 (3): 109 - 156
April April; 25 (4): 159 - 203	May May; 25 (5): 211 - 261	June June; 25 (6): 269 - 320
July July; 25 (7): 330 - 385	August August; 25 (8): 397 - 440	September September; 25 (9): 24 - 537
October October; 25 (10): 549 - 598	November November; 25 (11): 25 - 662	December December; 25 (12): 18 - 702