How many WorldCat records are available through Google and Yahoo! Search, and what fields within the records are provided to them?
Google and Yahoo! Search have, over time, indexed the same set of approximately 3.45 million records. This set includes the 3 million most widely-owned items in WorldCat, as well as a set of 450,000 records that represent unique items in the database. WorldCat records in the set have had the FRBR algorithm applied, so multiple versions of a work (e.g. different editions and formats) are rolled up under a single record. This allows the set to provide Web users access to approximately 75% of all WorldCat holdings. OCLC has made several field categories available for harvest by search sites. Five are visible to the user: title, author, publisher, standard identifier and electronic location. Why did OCLC assign accession numbers to the article-level records that are now included in WorldCat.org search results? The assignment of accession numbers facilitated the inclusion of the article-level records in WorldCat.org search results. Article-level records were not added to the WorldCat databa
