Jisc Library Hub Discover - Materials held in many UK national, academic and specialist libraries
WorldCAT - connects you to the collections and services of more than 10,000 libraries worldwide
The European Library - access to the collections of the 48 National Libraries of Europe and leading European Research Libraries.
The Library of Congress - Library of Congress collections contain over 162 million books, periodicals, manuscripts, maps, music, recordings, images, and electronic resources
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CORE - the world’s largest collection of open access research papers