Or "World Literature for Boys and Girls", Volume 6, which features English lit (イギリス）and includes "Peter Pan", "The Reluctant Dragon", "War of the Worlds" and "The Jungle Book". No publishing date is printed anywhere, so I searched:
This site gives a publishing date of 1970, and lists previous volumes and their dates, ranging from 1964 to 1972.
Auction of many volumes (the whole set?)
Google image search brings up a few photos.
That's what I could find out about it right now. I bought for about $5.00. My favorite illustrations are from "The Jungle Book" and signed by Asou Koga. (古賀 亜十夫)