1. Covance Laboratories Inc., P.O. Box 7545, Madison, Wisconsin 53707; Analytical Development Corporation, 4405 North Chestnut Street, Colorado Springs, Colorado 80907; Technical Assessment Systems, Inc., The Flour Mill, 1000 Potomac Street N.W., Washington, D.C. 20007; Baker Petrolite Corporation, 12645 West Airport Road, Sugar Land, Texas 77478; and Consultox, Limited, P.O. Box 1239, Damariscotta, Maine 04543