Use the Library Catalog to identify books, journals (but not journal articles), microform collections, and digital collections owned by the University of Illinois. The Library Catalog is the primary tool for exploring the collections of the University of Illinois Library, the second largest academic library collection in the United States. In the Library Catalog you can search for books by subject, and you identify the location within the Library of a particular book or journal. Books and journals are organized in the library by subject. Each item is assigned one or more subject headings and a unique call number. Subject headings are standardized terms from the Library of Congress. The call number is based on the Dewey Decimal Classification or Library of Congress Classification. Boolean operators must be capitalized if used: AND, OR, NOT. Interface automatically truncates some search terms unless Boolean operators are used within the same query line. You can also browse catalog records by call number, creating a "virtual shelf browsing" experience.

Use the I-Share catalog to find books not available at the University of Illinois (either because another patron has already charged this book, or because the book isn't part of the collection here). I-Share is a single catalog through which you can search and request books from the collections of 85+ academic and research libraries in Illinois. You request books from a participating I-Share library the same way you request books from University of Illinois libraries—simply click the "Request Item" tab, log in to your account (the same account you use to manage books you have borrowed from the University of Illinois Library), and complete the request. Books requested from I-Share libraries usually arrive withing three to four days, and you will receive an email when your book is ready to be picked up. You can borrow I-Share books for 4 weeks, and renew each book up to 3 times (for a maximum circulating period of 16 weeks).

A catalog of the Library's journal collection, with emphasis on online journals and periodicals. Most useful as a catalog of e-journals, but you can also use it to locate print copies.