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1991
January January 1991 81 (1): 11 - 113.	February February 1991 81 (2): 157 - 225.	March March 1991 81 (3): 287 - 390.
April April 1991 81 (4): 413 - 515.	May May 1991 81 (5): 561 - 659. Suppl : 7 - 63.	June June 1991 81 (6): 685 - 805.
July July 1991 81 (7): 835 - 933.	August August 1991 81 (8): 972 - 1079.	September September 1991 81 (9): 1109 - 1213.
October October 1991 81 (10): 1247 - 1348.	November November 1991 81 (11): 1391 - 1528.	December December 1991 81 (12): 1557 - 1680.