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What he said.
But, if you have access to recent version of MS Word you could try opening the PDF in it. If the PDF was created by Word you should get a reasonably faithful rendition which you can Save as DOCX and try converting that.
But don't get your hopes up too high, I deal with a lot of documents such as the one you describe. Even if I have access to the original manuscript DOCX, converting that to a format that can be read on an e-reader is rarely worth the effort.
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