Quick Search will find both ebooks and books available for checkout at the ISU Library.
On the results screen you can use Filters (on the right) to further refine your search. Look for the Format Type filter category and select Books to limit the results to books only. This search box automatically applies a "books and more" filter to your results, so you will need to use the Books filter to limit your results.
You'll find some ebooks using Quick Search, but you can also search and browse the ebook collections the Library subscribes to, such as Access Engineering and Knovel.
Use InterLibrary Loan (ILL) to order a book from another library. It's free but it does take a couple of days for the book to arrive.