1971
January January 1; 28 (1): 1 - 107	February February 1; 28 (2): 109 - 300	March March 1; 28 (3): 301 - 388
April April 1; 28 (4): 389 - 509	May May 1; 28 (5): 1 - 191	June June 1; 28 (6): 605 - 736
July July 1; 29 (1): 1 - 118	August August 1; 29 (2): 119 - 225	September September 1; 29 (3): 227 - 322
October October 1; 29 (4): 323 - 436	November November 1; 29 (5): 437 - 589	December December 1; 29 (6): 591 - 737