This 1926 Capitol Boilers & Radiators 3 ring notebook/manual is a valuable resource for anyone interested in heating systems. With over 100 pages of detailed information, this textbook covers the subject of boiler systems and is authored by U.S. Radiator Co. The manual is in a 3 ring binder format and is written in English. It is suitable for adult and further education levels, and is a must-have for anyone interested in the history of heating systems. The item weighs 9.3 oz. and has a length of 8″, a height of 1″, and a width of 5.5″. This textbook is a great addition to any collection and is a rare find for anyone interested in vintage heating systems.