Online Public Access Catalog - Union Catalogs

Union Catalogs

Although library catalogs typically reflect the holdings of a single library, they can also contain the holdings of a group or consortium of libraries. These systems, known as union catalogs, are usually designed to aid the borrowing of books and other materials among the member institutions via interlibrary loan. The largest such union catalog is WorldCat, which includes the holdings of over 70,000 libraries worldwide.

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    —D.H. (David Herbert)