1981
January January 1981 61 (1): 1 - 245	March March 1981 61 (2): 257 - 490
May May 1981 62 (1): 1 - 315	July July 1981 62 (2): 321 - 656
September September 1981 63 (1): 1 - 278	November November 1981 63 (2): 279 - 570