O-E Vapor System Manual
This manual was created by O-E Specialty Manufacturing Co. and outlines how to install the "O-E" Perfect System, which is a Vapor Vacuum heating system.
Consumers Research (1931)
This is a very early copy of what became Consumer Reports. It covers Heating and Ventilating, Lighting, Fire Extinguishers, and Building Materials. Great, unbiased insights into the popular methods used at the time.
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