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user-inactivated · 3222 days ago · link · · parent · post: I recently added a National Motor's Highway Six and Twelve manual to my collection. Wanna see?
My best used bookstore find was a copy of John Playfair's Elements of Geometry, of Playfair's Axiom fame, sitting on a metal shelf outside fading in the sun with all the other books they didn't think they could sell. I assume they thought "just an old textbook" and didn't bother to look it up. I gave it to the university library, because I was no collector and didn't have a clue what to do with a book like that. They gave me a receipt for around $3,000. I kind of wish I'd held on to it now, because there isn't much math history you can hold in your hands, but the tax refund did pay most of my tuition for a semester. If I ever decide to start collecting something, old Euclids will probably be it.