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1989
January January 1; 142 (1): 1 - 358 January 15; 142 (2): 365 - 734	February February 1; 142 (3): 737 - 1060 February 15; 142 (4): 1063 - 1410	March March 1; 142 (5): 1413 - 1781 March 15; 142 (6): 1785 - 2169
April April 1; 142 (7): 2173 - 2570 April 15; 142 (8): 2575 - 2968	May May 1; 142 (9): 2971 - 3350 May 15; 142 (10): 3353 - 3728	June June 1; 142 (11): 3731 - 4118 June 15; 142 (12): 4121 - 4534
July July 1; 143 (1): 1 - 385 July 15; 143 (2): 389 - 769	August August 1; 143 (3): 771 - 1073 August 15; 143 (4): 1077 - 1403	September September 1; 143 (5): 1407 - 1734 September 15; 143 (6): 1737 - 2081
October October 1; 143 (7): 2083 - 2421 October 15; 143 (8): 2425 - 2773	November November 1; 143 (9): 2775 - 3104 November 15; 143 (10): 3107 - 3413	December December 1; 143 (11): 3415 - 3864 December 15; 143 (12): 3867 - 4345