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It is an odd book but it is a copy of the 1930 edition of Werner Heisenberg's "The Physical Principle of Quantum Theory". The only thing he knew for sure was it was 50 bucks. I'm not sure what to call it either but it's an interesting piece.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.