Welcome to the Directory
Thesauri
 
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Websites  
American Society of Indexers - Thesauri Online 
Annotated directory.
http://www.asindexing.org/site/thesonet.shtml    More Info
Bartleby.com: Reference 
Includes "Roget's International Thesaurus of English Words and Phrases" and Houghton-Mifflin's "Roget's II: The New Thesaurus," third edition.
http://www.bartleby.com/reference/    More Info