1977
January January 1977 49 (1): 1 - 176	March March 1977 49 (2): 177 - 411
May May 1977 50 (1): 1 - 195	July July 1977 50 (2): 203 - 388
September September 1977 51 (1): 1 - 308	November November 1977 51 (2): 309 - 518