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Well if you have the order reference in your amazon purchase history, but the book isn't physically visible in your kindle library, then contact Amazon support

Well if you have the order reference in your amazon purchase history, but the book isn't physically visible in your kindle library, then contact Amazon support and ask them to sort it out - that sounds like a bug not a deliberate action.

beefman 4y ago
It may have been a bug but it coincided with the physical book going out of print, and reappeared in my Kindle library when the physical book was reprinted.