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Call toll free: 800-424*6747 Or write: American Chemical Society, Marketing Communications Department, 1155 Sixteenth Street NW, Washington, D.C. 20036 This publication is available on microfilm, microfiche, and electronically through Chemical Journals Online on STN International. ANALYTICAL CHEMISTRY, VOL. 59, NO. 18, SEPTEMBER 15, 1987 · 1113 A
