If you find a book that DePauw doesn't own (or that's packed away), and you have time (about a week), you can request the book via Interlibrary Loan (ILL). To do this, just click on the book's title, and then from the book record, click on the Blue "Request Item" button. In the form, add the last date that the book would be of value to you, then click Submit. You'll get an email when the book is here.
You can also limit your results list to ebooks, with the filters on the left.