When I set off making an SQL database over the books in the library, somebody asked me the pertinent question as to the (f)utility of the exercise. I am still working on the answer, but here, at least, is a list of ~3000 books which have been submitted as .mobi-files, but not as epub. I guarantee it is
not error-free; double-check that an epub edition does not exist before submitting a converted version.
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