UI - Going back to Open Library after reading a scanned book

(1) I look at a scanned book from a "read online" link.
(2) I am done looking at the book and want to go back to Open Library.
(3) As far as I can tell no links on the page can get me back to the page that launched the book browser.
(3a) This is a problem if I have clicked on a lot of pages in the book because each page click makes a new entry in my browser history
(3b) There are no links back to any page on Open Library as far as I can tell. Each link that is not a book-navigation link takes me to archive.org instead

Suggestions:
- Consider overhaul to the page that displays the books because you lose all site context and the icons are fairly unclear
- Definitely have a link to Open Library's front page from any book page
- Consider having direct link back to the page from which user gets to the scanned book