1981
January January 1; 48 (1): 1 - 148	February February 1; 48 (2): 157 - 301	March March 1; 48 (3): 309 - 448
April April 1; 48 (4): 455 - 594	May May 1; 48 (5): 601 - 761	June June 1; 48 (6): 767 - 942
July July 1; 49 (1): 1 - 271	August August 1; 49 (2): 281 - 550	September September 1; 49 (3): 557 - 823
October October 1; 49 (4): 829 - 1062	November November 1; 49 (5): 1069 - 1211	December December 1; 49 (6): 1217 - 1364