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1968
January January; 40 (1): 1 - 134	February February; 40 (2): 137 - 264
March March; 40 (3): 267 - 394	June June; 41 (2): 139 - 300
July July; 41 (3): 303 - 458	October October; 42 (2): 171 - 358
November November; 42 (3): 363 - 486