| unesco.org | United Nations Educational, Scientific and Cultural Organisation (UNESCO) |
| twas.org | TWAS, Third World Academy of Sciences |
| iupac.org | International Union of Pure and Applied Chemistry (IUPAC) |
| esf.org | EURESCO Conferences |
| erpanet.org | Erpanet - Electronic Resource Preservation And Access Network |
| delphion.com | Delphion Intellectual Property Network |
| cas.org | Chemical Abstracts Service (CAS) |
| nsf.gov | National Science Foundation |
| nist.gov | National Institute of Standards and Technology (NIST) |
| usda.gov | Integrated Taxonomic Information System |
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