The
current guidelines already say:
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If you find that the book has already been uploaded, you are very welcome to upload a new version provided that it "adds" something different to the version already present [...] and state in the description of your book how it differs from the earlier version.
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Uploads here should add some notable "value" to a PG (or whatever) original
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I guess this could be rewritten to basically say: "State the source of your text and how your upload differs from it and other versions that can be found in the library"