Explore the fascinating world of science with the 1964 Young People's Science Encyclopedia Set. This hardcover book set, published by Children's Press, features illustrated articles on various scientific topics, including mathematics and technology. The set includes volumes 1-20, published in 1966, and is intended for young adults and adults. Discover the wonders of science and technology with this comprehensive encyclopedia set, perfect for anyone interested in the subject. The books are in English and cover a wide range of topics, from the basics to the advanced. With its informative content and captivating illustrations, this set is sure to spark a passion for science in readers of all ages.