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1968
February February; 134 (1): 1 - 219.	April April; 134 (2): 221 - 366.	June June; 134 (3): 367 - 532.
August August; 135 (1): 1 - 261.	October October; 135 (2): 263 - 444-1.	December December; 135 (3): 445 - 584.