http://copac.jisc.ac.uk/search/form/main: "Copac exposes rare and unique research material by bringing together the catalogues of c.90 major UK and Irish libraries (and growing). In a single search you can discover the holdings of the UK’s national libraries (including the British Library), many University libraries, and specialist research libraries.  Researchers and educators use Copac to save time in their research, to quickly and easily discover and locate resources, to check document details, review materials in their field, and assess the rarity of materials etc. Information professionals trust Copac to give them access to a unique pool of high-quality bibliographic information.

"Searching Copac means you are searching a wide and varied range of library catalogues, from the collections of the Oxford and Cambridge universities to the libraries at the National Trust and the Royal Botanic Gardens Kew. Copac’s contributors run the gamut from conservatoires to the catalogues of the major Russian and East European Collections in the country. We are adding more libraries all the time with a focus on specialist research collections, for example the Middle Temple Library and Institution of Mechanical Engineers Library, increasing the visibility of a growing range of specialist and rare materials" (accessed 12-2016).