----------------------------Original message---------------------------- 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