Many items in these catalogs may be available for you to borrow through interlibrary loan. Please check NUsearch first to see if Northwestern owns the materials you need, though if an item is owned by checked out or missing, you may request through interlibrary loan.
The world's most comprehensive catalog of library holdings, particularly (though not exclusively) from North American libraries, containing over 2,000,000,000 records from over 10,000 libraries. You can request items from Worldcat through interlibrary loan by clicking the ILL button.
Combined catalog for the Big Ten Academic Alliance libraries, plus the University of Chicago and the Center for Research Libraries. Generally, submitting interlibrary loan requests through NUcat is the preferred method, but checking UBorrow can let you know if a particular books is available at BTAA libraries, which generally provide the fastest services to us.