Which textbook to use with Problems and Theorems in Analysis by Pólya and Szegő?

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I'm currently studying Pólya and Szegő's classic problem collection Problems and Theorems in Analysis. Does anyone know whether they originally wrote it with a specific analysis textbook (or series of such textbooks) in mind to be studied alongside it? If this isn't the case, which textbooks — preferably from the same era as P & S — would most closely fit the exercises? Courant perhaps?