23x20: 1983-03-30
23x19: 1983-03-16
23x18: 1983-03-02
23x17: 1983-02-23
23x16: 1983-02-16
23x15: 1983-02-09
23x13: 1983-01-27
23x12: 1983-01-19
23x11: 1983-01-12
23x08: 1982-12-15
23x07: 1982-12-01
23x06: 1982-11-24
23x04: 1982-11-10