1989
January January 1; 86 (1) : 1 - 406 January 15; 86 (2) : 407 - 754	February February 1; 86 (3) : 755 - 1103 February 15; 86 (4) : 1105 - 1430	March March 1; 86 (5) : 1431 - 1740 March 15; 86 (6) : 1741 - 2121
April April 1; 86 (7) : 2123 - 2520 April 15; 86 (8) : 2521 - 2989	May May 1; 86 (9) : 2991 - 3442 May 15; 86 (10) : 3443 - 3927	June June 1; 86 (11) : 3929 - 4333 June 15; 86 (12) : 4335 - 4802
July July 1; 86 (13) : 4803 - 5216 July 15; 86 (14) : 5217 - 5670	August August 1; 86 (15) : 5671 - 6011 August 15; 86 (16) : 6013 - 6440	September September 1; 86 (17) : 6441 - 6829 September 15; 86 (18) : 6831 - 7298
October October 1; 86 (19) : 7299 - 7662 October 15; 86 (20) : 7663 - 8174	November November 1; 86 (21) : 8175 - 8594 November 15; 86 (22) : 8595 - 9051	December December 1; 86 (23) : 9053 - 9635 December 15; 86 (24) : 9637 - 10180