You can see this 1818 edition of Bewick's Fables of Aesop at the International Children's Digital Library or at the Internet Archive, and you can read about Thomas Bewick's life and his career as an engraver in this Wikipedia article. Click here for more illustration slideshows. I've also put up the illustrations for Bewick's Select Fables of Aesop!
Here is the Bewick slideshow (apologies to iPad users - the Flickr.com slideshows are Flash-based, but you can view the Flickr album directly if the slideshow does not work):
