To check whether the Library has the book you need, go to KeissCat, the Library Catalog, on the Library's homepage (in the pull-down menu Library Catalogs). Type in the exact title of the book you need and change the pull-down menu to Title. If the book is available, you will see a screen with all of the information about the book, including its call number and its location in the Library.
The Library does not have copies of every textbook for every class, but we do have some copies that have been placed on Reserve by instructors at the Circulation Desk. Also, if the Library Catalog says that the book is available in the Main Stacks it means that it can be found on the bookshelves and you can borrow it for three weeks.
Please ask the librarians at the Reference Desk or call 215-646-7300 ext. 21484 if you have any questions.