Forgive me if there's an easily available answer, I have not been able to find it after several attempts. I know there is an ebook but I would like a hard copy of Rationality A-Z or the original sequences as a (set of) books. 

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Quadratic Reciprocity

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There are physical paperback copies of the first two books in Rationality A-Z: Map and Territory and How to Actually Change Your Mind. They show up on Amazon for me.