【Item Details】 Rare out-of-print old books, including the first editions from 1971 (Showa 46). This is a set of 4 books from the Shogakukan Introduction Encyclopedia Series. ① Series 5. Baseball Introduction (Offense) 9th edition, April 1, 1975 ② Series 11. Baseball Introduction (Defense) / With cover First edition, 1st printing, July 20, 1971 ③ Series 13. Baseball Rules Introduction 10th edition, April 20, 1976 ④ Series 2. Swimming Class / With cover 2nd edition, August 1, 1971 【Item Condition】 Stored at home. Purchased in the early 1970s and stored at home. As these are old books, each has damage to the exterior, scratches, stains, yellowing, and discoloration due to age. However, the contents are relatively clean. Please refrain from purchasing if you are looking for a perfect item or are very particular about condition. Thank you.