If you're specifically looking for books in the SLU Libraries you'll find that searching the SLU Libraries Catalog is easier than searching SLUth Search Plus. The catalog is an inventory of materials that are available in and via the SLU Libraries, including books, journals, magazines, newspapers, and media materials. What it doesn't include is individual articles. You'll need to use SLUth Search Plus for that.
Watch this short video to learn how to find print and ebooks using the SLU Libraries Catalog and locate print books in Pius XII Memorial Library.