1970
January January 1; 26 (1): 1 - 134	February February 1; 26 (2): 135 - 267	March March 1; 26 (3): 269 - 418
April April 1; 26 (4): 419 - 526	May May 1; 26 (5): 527 - 660	June June 1; 26 (6): 661 - 812
July July 1; 27 (1): 1 - 147	August August 1; 27 (2): 149 - 294	September September 1; 27 (3): 301 - 486
October October 1; 27 (4): 487 - 634	November November 1; 27 (5): 635 - 865	December December 1; 27 (6): 867 - 1136