Which of the following is a research tool containing information on the holdings of many different libraries?

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A tool that shows which libraries hold a given item across many institutions helps you locate sources beyond your own library. WorldCat fits this purpose as a global union catalog that gathers holdings information from thousands of libraries. By searching a title, author, or ISBN, you can see which libraries have the item, check its availability, and often find different editions or formats. This makes it easy to plan where to access or borrow the resource, even if it isn’t in your home library.

Project Gutenberg provides free, public-domain eBooks, not a cross-library holdings catalog. HathiTrust is a large digital library of scanned works; while it offers access to many digitized items, it isn’t primarily a comprehensive catalog of where libraries hold physical copies. PowerSource isn’t a library holdings resource.