Can not view bottom part of pages that have large, or possibly whole page with one image. Having the problem with "The Jepson Manual"

Viewing "The Jepson Manual" on a  Lenovo laptop running Windows 7, I am not able to access/view the bottom of pages that appear to be a single image.  It is an ePub.  I can view the page if I set the text size to very small, but then the image quality is so bad as to be useless.