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I've been collecting old heating books and antique trade magazines for nearly 40 years. The Library contains PDF scans of much of that material, along with lots of submissions from friends. You'll also find some article and worthy links here. Take what you'd like. I hope it helps you to better understand that old system, and perhaps to solve some problems. If you have something you'd like to add to the Library, please scan it and send it to me as a PDF document. I'll add it and credit you. The more we share, the smarter we'll all be. Thanks. - Dan Holohan