Area Library Catalogs
Internet Archive eBooks and Texts
The Internet Archive offers over 15,000,000 freely downloadable books and texts. There is also a collection of 550,000 modern eBooks that may be borrowed by anyone with a free archive.org account.
National Academies Press - many free books covering a wide range of topics
Public domain, full-text ebooks/publications - includes Project Gutenberg
Gutenberg-e - free, historical publications