This is a set of four issues of the Sunday Mainichi extra edition, covering the 58th to 61st annual Japanese Industrial League Baseball (Toshi Taiko Yakyu) tournaments (1987-1990). Each issue features a power analysis and profiles of the 32 representative teams for each tournament. The stage for the Toshi Taiko Yakyu moved from Korakuen Stadium after the 58th tournament to the Tokyo Dome starting with the 59th tournament. Star pitchers like Nomo (Shin-Nittetsu Sakai), Shiozaki (Matsushita Electric), and Yoda (NTT Tokyo), as well as players like Furuta (Toyota Motor) and Hiroshi Ishii (Prince Hotel) were active. While it should be readable, it is an old magazine. It was stored in a box, but there is significant deterioration of the paper due to aging, and there is fading. The pages with text are more yellowed and brownish in reality than they appear in the images, so please be aware of this. This is a long-term storage item by an amateur, so please refrain from purchasing if you are concerned about stains or if you are looking for a good or beautiful condition item. We hope that those who are fans of industrial league baseball and understand that this is a used magazine sold as-is will consider purchasing it. Thank you for looking.