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http://thesaurus.nbii.gov/portal/server.pt - The Biocomplexity Thesaurus displays facets of an entry term, concepts related hierarchically or associatively to the entry term in the fields of biology, ecology, environmental sciences, and sustainability. This is not your ordinary thesaurus! |
http://thesaurus.com/ - Roget's II: The New Thesaurus by the Editors of the American HeritageŽ Dictionary. |