1968
February February 1968 15 (1): 1 - 183	March March 1968 15 (2): 185 - 336	April April 1968 15 (3): 337 - 459
June June 1968 16 (1): 1 - 157	July July 1968 16 (2): 159 - 318	August August 1968 16 (3): 327 - 517
October October 1968 17 (1): 1 - 230	November November 1968 17 (2): 235 - 408	December December 1968 17 (3): 419 - 586