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The British Library Integrated Catalogue
- the British Library contains over 150 million items. This catalogue lists over 12 million items in the British Library's collections.
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UK |
COPAC
- offers access to the online catalogues of some of the largest university research libraries in the UK and Ireland.

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UK |
Libraries Australia Union Catalogue
- It is a union catalogue of more than 40 million items.
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AT |
Library of Congress
- the largest library in the world and the research arm of the U.S. Congress. The online catalogue contains approximately 12 million catalog records.
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US |
Melvyl System (University of California)
- an union catalogue of California's university libraries which contain over 9 million titles.
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US |
OhioLink
- a consortium of Ohio's college and university libraries and the State Library of Ohio which contain more than 24 million library items.
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US |
Pacific Rim Digital Library Alliance (PRDLA)
- a consortium of academic libraries joined together to facilitate improved access to scholarly research materials throughout the Pacific Rim.
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