| 1 | World-Cat | OPAC |
| 2 | Library of Congress Catalouge | OPAC |
| 3 |
Library and Archive | British Museum |
OPAC |
| 4 | World Meteorological Organization | OPAC |
| 5 | World Digital Library | OPAC |
| 6 | UNESCO Library | OPAC |
| 7 | UNESDOC | OPAC |
| 8 | World Bank Library | OPAC |
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