Ooh! I never thought of that, I have a LOT of vintage books (most foreign, French, German) that I picked up from the thrift store. My campus was close to an "Out of the Closet" and I'd bring home as many books as I could fit into my napsack. Sometimes, bags. People thought I was so weird, I'd be carrying neon pink bags filled with old books! haha.
The only qualm I had about selling them is the shipping, they're pretty heavy. I mean if it's truly a relic, someone wouldn't mind paying $10 to ship (don't recommend sending it through media mail, can take 4 weeks to get to it's destination,lol)
Good luck with your endeavors, it sure sounds really neat!!! :)