A catalogue of stock in the various departments of a library, or a number of libraries, indicating locations.
A combined catalog for an entire library system or group of cooperating libraries.
A catalogue that lists, completely or in part, the holdings of more than one library or collection.
a combined catalogue of all the University's Libraries and departmental libraries.
a combined catalogue of several smaller catalogues. For example, COPAC is a union catalogue of several university library catalogues, as is MELVYL.