This is a very useful series of posts
So it looks like the _best_ options are for PDFs
1) Mobipocket/Calibre
PDF->html->PRC->epub
https://wiki.mobileread.com/wiki/MobiPocket_Creator
https://wiki.mobileread.com/wiki/Calibre
Does this work better than simply opening the HTML directly in Sigil?
and/Or cleaning the html prior to Sigil?
2) Acrobat Pro/Calibre
PDF -> RTF -> epub
3) If OCR required
ABBYY -> html -> Sigil?
Or is ABBYY -> RTF-> Calibre better?
Is epub the best end format? I've been reading stuff in html on my pocketbook 360 as I find using the browser better on my cellphone (nokia n900) than fbreader
Also it seems the best bet for text book style books is just to leave them in pdf, crop them or OCR them (follow #3)?
Also does any of these methods handle math symbols?