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1968
April April; 31 (4): 449 - 594	June June; 31 (6): 749 - 892
July July; 32 (1): 1 - 143	August August; 32 (2): 145 - 302
September September; 32 (3): 303 - 439	October October; 32 (4): 449 - 591
November November; 32 (5): 593 - 739	December December; 32 (6): 741 - 900