Here's one I'll bet no one has ever heard of: DRIVIN' WOMAN by Elizabeth Pickett Chevalier. Published in 1942, it is a GONE WITH THE WIND knockoff. This is the opening paragraph:
"In that opaque land between sleep and wakefulness, she wrestled anxiously with the giant of her future. How could she, a girl—single-handed—restore the old way of life to Virginia in time to assure suitable marriages to herself and her three younger sisters."
The thing is 652 pages long, and large parts of it are in dialect.
Full disclosure: I didn't actually FINISH this book. Anyone who wants to try can find it at Abebooks