This lot includes three books from Supreme Publications, covering the most often needed radio diagrams from 1926 to 1940. Also included is a Gernsback Radio Encyclopedia in poor condition but still useable. The books are a valuable resource for collectors and enthusiasts of vintage radios, offering comprehensive diagrams to aid in restoration and repair. Each book covers a range of years and includes diagrams for various brands and models. These books are a must-have for anyone looking to maintain the authentic look and functionality of their antique radio collection.