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To those of you intrepid librarians who came up with the answer:
Many thanks.
 
To any of you interested in the topic, including Eric Fowler to whom
I have been trying to return a phone call, the answer is endoreic
rivers that drain into enclosed, interior basins.
 
Was it hard to find?  Just ask a librarian.
 
 
Anna R. Carson, Asst. Dir.                  (812)237-2306
Office of Institutional Research and Testing
Indiana State University
Terre Haute, IN  47809