The world's most comprehensive catalog of library holdings, particularly (though not exclusively) from North American libraries, containing over 2,000,000,000 records from over 10,000 libraries.

ArchiveGrid is a collection of over three million archival material descriptions, including collections held by thousands of libraries, museums, historical societies. Access is provided to detailed archival collection descriptions and contact information for the institutions where the collections are kept. ArchiveGrid data is primarily focused on archival material descriptions for institutions in the United States but now also includes information about collections in Australia.