If all you need is an image, can't you just use browser automation tools to screenshot each page? After all, much of the content is in images so it's not like you need it OCRed for accessibility purposes.
rs186
If you can live with lower quality image. Most people probably will be ok with that though.
makeitdouble
It will depend on the books, but the images aren't that high resolution in general.
I've had some slightly blurry on 2.8x1.9k screens, especially the older ones.