Not sure what you mean by this, Folkrelic: "Amazon prints the books they sell."
Yes, Amazon does some print-on-demand, but I believe that is in association with particular publishers who don't produce hard-copies. These are mainly small, vanity-type concerns.
As far as mainstream publishers go, books I have bought from Amazon over many many years have been the same article as found in bricks-and-mortar retailers.
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sj