Kato N Gauge Layout Plan Collection, Unitrack. It is presumed to have been published by KATO (Katsumi KATO) in 1984. There is a fold on the upper left of the pages in the latter half. The sides are clean, and the condition is not so bad. The condensed content on page 57 can be seen clearly. The original price at the time was 500 yen. Recommended for enthusiasts. Thank you very much.