'Catalogs, Booksellers' are organized lists of books or publications for sale, issued by businesses specializing in the retail trade of books, providing detailed information on each title's author, subject, price, and other relevant details.

'Catalogs, Library' are systematic listings or databases of an organized collection of library resources, such as books, periodicals, multimedia materials, and digital assets, that provide comprehensive descriptions, locations, and access information to facilitate efficient retrieval and usage.

Ordered compilations of item descriptions and sufficient information to afford access to them.

'Union Catalogs' in a medical context refers to a comprehensive and centralized listing of all cataloged resources, such as books, journals, and articles, from multiple libraries or institutions, enabling consolidated search and discovery across various sources, facilitating research and knowledge sharing.

Activities performed in the preparation of bibliographic records for CATALOGS. It is carried out according to a set of rules and contains information enabling the user to know what is available and where items can be found.