Quote:
Originally Posted by Amiieey
...There's no complex things like two columns or actual images/graphs, they're just PDFs from older books at Archive.org.
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If they are from Archive.org then they very well have an extremely complex structure even though they seem to only be scanned pages.
I've seen books from them that had several "layers" on each page. These stand out as they have a scan of a blank page, with its "aged" look, as a background with separate layers for the image and text scans, each with transparent backgrounds to reveal the "aged paper" page background. You can spot these as the same "flaws" in the background appear on multiple pages.
I've found that my old Kindle Keyboard fails to display these well, but if I open the PDF on a PC and print it using a PDF printer driver to create a PDF file the resulting "flattened" PDF displays properly on my Kindle.