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.
Dunham Heating System Handbook No. 414
Here's a link to a PDF of the Second Edition of the Dunham Handbook. Special thanks to Colin Rush, who found it and shared the news with us. There's no date on this one but it's most likely late-'30s. Dunham did a superb job of filling their handbooks with useful information.
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