1966
January January 1; 18 (1): 1 - 112	February February 1; 18 (2): 113 - 236	March March 1; 18 (3): 237 - 348
April April 1; 18 (4): 349 - 467	May May 1; 18 (5): 469 - 624	June June 1; 18 (6): 625 - 785 June 1; 18 (S6): 1 - 174
July July 1; 19 (1): 1 - 220	August August 1; 19 (2): 221 - 466	September September 1; 19 (3): 467 - 672
October October 1; 19 (4): 673 - 863	November November 1; 19 (5): 865 - 992	December December 1; 19 (6): 993 - 1130