1981
February 1981; 43 (1): 3 - 70	April 1981; 43 (2): 95 - 185	June 1981; 43 (3): 191 - 280
August 1981; 43 (4): 291 - 372	October 1981; 43 (5): 381 - 451	December 1981; 43 (6): 473 - 543