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The following are essential or advanced research tools that graduate students are likely to use:
WorldCat is a union catalog of the holdings of more than 10,000 libraries worldwide, with listings for more than 500 million books and other items. Use WorldCat to identify items not held by UW System libraries, and to request to borrow such items via Interlibrary Loan
. (Note: Among UW libraries only the holdings of UW-Madison are indicated in WorldCat.)