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1980
January January; 50 (Number 1) :1 - 206	February February; 50 (Number 2) :207 - 375	March March; 50 (Number 3) :377 - 561
April April; 50 (Number 4) :563 - 765	May May; 50 (Number 5) :767 - 998	June June; 50 (Number 6) :997 - 1235
July July; 51 (Number 1) :1 - 256	August August; 51 (Number 2) :257 - 520	September September; 51 (Number 3) :521 - 782
October October; 51 (Number 4) :783 - 1031	November November; 51 (Number 5) :1033 - 1247	December December; 51 (Number 6) :1249 - 1503