WorldCat
WorldCat is a global union catalog of library collections. It aggregates bibliographic records and library holdings from libraries around the world, creating a centralized resource that researchers, students, and the public can use to locate items in participating libraries. The catalog is managed by OCLC, a nonprofit library cooperative that coordinates cataloging, interlibrary loan, and other library services for member institutions.
WorldCat contains millions of records describing books, journals, audiovisual materials, digital resources, and more. Holdings data
The system originated in the late 20th century as a cooperative cataloging effort and has since grown