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2009
January January 1 ; 20 (1): 1 - 569 January 15 ; 20 (2): 571 - 744	February February 1 ; 20 (3): 745 - 1118 February 15 ; 20 (4): 1119 - 1267	March March 1 ; 20 (5): 1269 - 1604 March 15 ; 20 (6): 1605 - 1889
April April 1 ; 20 (7): 1891 - 2129 April 15 ; 20 (8): 2131 - 2350	May May 1 ; 20 (9): 2351 - 2519 May 15 ; 20 (10): 2521 - 2638	June June 1 ; 20 (11): 2639 - 2808 June 15 ; 20 (12): 2809 - 3002
July July 1 ; 20 (13): 3003 - 3167 July 15 ; 20 (14): 3169 - 3450	August August 1 ; 20 (15): 3451 - 3617 August 15 ; 20 (16): 3619 - 3771	September September 1 ; 20 (17): 3773 - 3984 September 15 ; 20 (18): 3985 - 4129
October October 1 ; 20 (19): 4131 - 4266 October 15 ; 20 (20): 4267 - 4470	November November 1 ; 20 (21): 4471 - 4628 November 15 ; 20 (22): 4629 - 4870	December December 1 ; 20 (23): 4871 - 5036 December 15 ; 20 (24): 5037 - 5313