A union catalog contains cataloging records from more than one collection or library. Example: WebLUIS/USF lists the material available in all the University of South Florida Libraries. WebLUIS Union Catalog lists all the material available at Florida's ten state university system libraries including USF.

A catalog which lists materials held by a group of libraries.

an accessible list of the combined cataloged holdings of all the libraries in a library system or of the collections of a group of independent libraries

an index for several collections

A catalog of the holdings of more than one independent library, library system, or library collection, indicating the location of each item by the names or location symbols of the libraries or collections which own at least one copy.

a catalog that lists, completely or in part, the holdings of more than one library or collection (e.g., WorldCat). (C&C)

Electronic catalog of the combined collections of multiple schools or an entire school system.

A collection of library catalogs, or the items they contain, in a central location that can be accessed with one search.

Central catalog listing of library materials located in various libraries with individual library holdings indicated. The catalog may exist in a variety of formats.

A database that contains the holdings of multiple libraries. Examples are Prospector and ACLIN for Colorado libraries.

A catalog that represents the holdings of more than one repository (archive, library, or museum).

A single catalog that contains records about materials in several collections or libraries.

In library science, a union catalog is a collection of bibliographic records describing the holdings of multiple (and often many different) library. Union catalogs have been created in a range of media, including book format, microform, cards and more recently, networked electronic databases. Print union catalogs are typically arranged by title, author or subject (often employing a controlled vocabulary); electronic versions typically support keyword and Boolean queries.