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Once you have the PDF file, you might try PDFLRF which converts PDF files to LRF files. I have found that it works just fine, although I haven't done what you've done, scanning books into PDF files. But it does work on googlebooks, which are simply paper books which have been scanned into PDF files.
When you scan the books, what graphics format did you use before converting them into PDF files? Maybe if you use jpg graphics instead of tiff graphics your files would show up.
That's just a suggestion, based on no experience whatsoever but knowing that sometimes the graphics format can make a difference in such things.
Good luck!
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