One comparison that I did was to look up Robert Heinlein on both amazon and sony. Amazon had 6 books - Space Cadet, Glory Road, Red Planet, Double Star, For Us the Living and The Puppet Masters. Sony has 3 books - The Puppet Masters, Stranger in a Strange Land and For Us, the Living. So Amazon has 4 that Sony doesn't have while Sony has 1 that Amazon doesn't have. While this isn't conclusive, I suspect that those who think that the difference is just self published books, or duplicate titles are engaged in wishful thinking.
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