This is an online library in the State of Michigan. To find ebooks, do a search for a book title and then refine the search results to show ebooks.
Inkmesh is a search engine that can help you find free ebooks.
When searching for free online ebooks be sure to check the box that says: Show only ebooks. Look at this Help doc for additional useful info: https://openlibrary.org/help/faq/reading