UMI Number:9984623 UMI UMI Microform 9984623 Copyright 2000 by Bell Howell Information and Leaming Company. All rights reserved.This microform edition is protected against unauthorized copying under Title 17,United States Code. Bell Howell Information and Leaming Company 300 North Zeeb Road P.0.Box1348 Ann Arbor,MI 48106-1346