Thanks for replying!
It has about 80 html files and a lot of graphics generated during the scanning process that look like smeared pages. I honestly can't remember if it validated originally but I have Sigil set to validate w/flight crew every time I save (in hopes this somewhat idiot proofs what I'm trying to do :P).
After my original post, I DID go back in and delete all those crummy graphics and that seems to have helped. It hasn't crashed since.
Ergo, there must be some sort of size limit so, as I continue, I should probably figure out how to split the file. I think it's too late to split it in Calibre now but I'll probably do that next time I come up against a really large file!
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