Amazon found that they were flooded with redone public domain material - all of them with some enhancement. They just didn't see the need for 100 recompilations. They announced last spring that if you were not the copyright holder of the material, they wouldn't accept it, even if it was legal. They were working on some methods to let in scholarly editions, but I don't now what the status is.
Bottom line, recompilations and links aren't enough for them to accept it as a new edition any more.
Camille
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