Library catalogues

WorldCat is a union catalog that itemizes the collections of tens of thousands of institutions (mostly libraries), in many countries, that are current or past members of the OCLC global cooperative. It is operated by OCLC, Inc. Many of the OCLC member libraries collectively maintain WorldCat's database, the world's largest bibliographic database. The database includes other information sources in addition to member library collections. OCLC makes WorldCat itself available free to libraries, but the catalog is the foundation for other subscription OCLC services (such as resource sharing and col

register of all bibliographic items found in a library or group of libraries

online project for book data by the Internet Archive

COBISS (short for Co-operative Online Bibliographic System and Services) is an organizational model of joining libraries into a national library information system with shared cataloguing, the COBIB union bibliographic catalogue database and local bibliographic databases of participating libraries, the COLIB database on libraries, the CONOR authority database, and with a number of other functions.

combined library catalog describing the collections of a number of libraries

youth literature catalogue

catalog of incunabula

library catalog