Grolier International, 1959-66 English, Hardcover, with flexi-discs Size: 220 x 185mm This is a set of 19 books from the "LET'S FIND OUT BOOKS" series, an American educational picture book series. These books explain familiar things like animals, air, and the sun in simple English with single-color illustrations. Martha and Charles Shapp wrote most of the original works. Each book comes with a colorful flexi-disc that reads the contents of the book. The condition of the flexi-discs is unconfirmed due to the lack of a playback device. There are some stains due to aging.