You can find e-books in many different subject areas through Ebook Central.
Titles can be downloaded or read online. You can also use the "Print to PDF" option to access a few pages, such as a chapter, and save these as a PDF that can then be printed or saved.
Some books can be downloaded in full and saved for up to 21 days. In order to do this, you need to create an Ebook Central account. You will also need either Adobe Digital Editions or Bluefire to be able to read the downloaded book.
Most of the books in Ebook Central can be read by several people simultaneously, but some titles can only be read by 1-3 people at a time. Check back later if the book you are interested in is not currently available for access.