Thanks to Lance Eaton for sharing some great information about wowio
. This online site offers readers the opportunity to download pdf versions of all sort of texts, including graphic novels and comic books. There is a registration process and a limit to how much one can download per month, but it is completely free. Sponsors make sure all the right people are paid, so you can download and read guilt-free.
By selecting "comics and graphic novels" in the browse function, I was transported to a page where I could view selections by title, genre, age, or publisher. Under "genre" there was even a special section for comics produced for educational purposes. Other categories included "religious," "myths and legends," and "historical fiction."