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1991
January January; 40 (1): 1 - 158	February February; 40 (2): 161 - 303	March March; 40 (3): 305 - 404
April April; 40 (4): 405 - 520	May May; 40 (5): 521 - 651	June June; 40 (6): 653 - 790
July July; 40 (7): 791 - 942	August August; 40 (8): 943 - 1084	September September; 40 (9): 1085 - 1222
October October; 40 (10): 1223 - 1363	November November; 40 (11): 1365 - 1564	December December; 40 (12): 1565 - 1745