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1. Library of Congress
2. National Library of Canada
3. MELVYL
4. OhioLink
5. LIBRIS
6. COPAC
7. Barton: MIT Libraries' Catalog
8. National Library of Medicine
 
9. the Brown University
10. Carnegie Mellon University
11. New York University
12. Princeton University
13. Yale University
14. Oxford University
15. London School of Economics
16. University of London