CLICsearch is the library catalog of six private colleges and universities in the Twin Cities, including Saint Thomas. Books from other campuses can be requested online and delivered to the St. Thomas library of your choice. It also includes journal articles from general databases.
Google Books is a collection of digitized books and periodicals. If the book is out of copyright, or the publisher has given its permission, the entire text. If it's in the public domain, you're free to download a PDF copy.