Over 360 beautiful color photos display machine-made marbles in many varieties. They were produced by American manufacturers, including Alley Agate, Champion, Jackson Marble, Master Glass, Playrite, and Vacor. Marbles displayed include Cat's Eyes, Glassies, Moss Agates, Opals, Patches, Swirls, and more. The text provides fascinating facts about each company's marble production. A helpful rating system indicates which marble types from each firm were its good, better, or best work. A bibliography and index are included. Values for the marbles displayed are found in the captions. This book will be a thrill for all who enjoy a passion for beautiful glass.