Quick Search will find both ebooks and books available for checkout at the ISU Library.
ISU Library Quick Search
Find Books & More (ISU Collections)
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 further limit your results.