Some of the Baen books (can't recall offhand which ones) have maps & other glyphs buried after the cover page. Manybooks normally doesn't include these - at least they don't when they convert .html works from Gutenberg. I don't know about feedbooks. When I have done my own conversions (for my own use) of Baen .rft to .pdf, I usually resize the glyphs to be a full page before the conversion.
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