Thank you all for your help. I really appreciate it.
I'm a little embarrassed to admit I gave up. There were also pictures embedded in the original books and well...anyway. So I started looking again today for another copy of the book. I thought maybe I could find the "original" copy before they did that awful conversion on it. And lo and behold - Smashwords had a copy for sale! I downloaded a preview version to run through Sigil to make sure it was not the same one, and this one was a true HTML copy.
Some day maybe I will learn Regex but this will not be the day
