WorldCat is a comprehensive online catalog of library holdings. lists books, journals, maps, recordings, films, scores, and other materials located in ove 6000 public, academic, corporate, school and specialized libraries all over the world. Check WorldCat for holdings of materials that are not available at Princeton University Library; these items can be requested through Interlibrary Loan or Borrow Direct. Items that are available here are usually marked with this icon: PRINCETON UNIV , but double check to be sure. You can use the icon to quickly search Main Catalog for that item; this is essential because the item might be checked out, lost, or unavailable for some other reason.