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	Virtual Reference Desk Abstract NASA Thesaurus This is an electronic version of the NASA Thesaurus. This is an experimental project. A PDF version of the 1998 Thesaurus is also available: Vol. 1; Vol. 2. Go to this Site NOW Subjects for this Item: ASTRONOMY The Virtual Reference Desk http://www.virtualref.com/ Copyright © 1997 Christopher C. Brown Revised: 2/11/01