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5 “... was held il1 Las vegas, Nevada, July 13 -17, 1992. The symposium upon which this volume is based...”

6 “... is planned in Las Vegas , July 13-17 , 199 2 . l As pointed out in the Preface to the earlier two volumes ,2...”

7 “... of the American Chemical Society in Las Vegas, Nevada, March 29 - April 1, 1982. Also included are invited papers...”