Copyright 1996 by Loyola College in Maryland. The U.S. government retains a nonexclusive and nontransferable license to exercise all exclusive rights provided by copyright. The ISBN number for this report is 1-883712-40-8. This report is distributed by the National Technical Information Service (NTIS) of the U.S. Department of Commerce as NTIS Report # PB96-157490. A list of available JTEC/WTEC reports and information on ordering them from NTIS is included on the inside back cover of this report.