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A member on our boiler page on Facebook worked for Dunham Bush and was giving everything away. I snagged all the books and a coin. Lots of Dunham magazine books. Dunham pocket guides. An ASHRAE pocket guide and a book on power plants.
The binders aren’t quite as old. They are boiler manuals / wiring diagrams from older brands like Kewanee and Iron Fireman.
Never stop learning.