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Contributors J. T. BERGEN, Armstrong Cork Company, Lancaster, Pennsylvania J. L. ERICKSEN, Mechanical Engineering Department, Johns Hopkins Uni- versity, Baltimore, Maryland JOHN D. FERRY, Department of Chemistry, University of Wisconsin, Madison, Wisconsin E. H. LEE, Brown University, Providence, Rhode Island HERSHEL MARKOVITZ, Mellon Institute, Pittsburgh, Pennsylvania ROBERT S. MARVIN, National Bureau of Standards, Washington, D. C. KAZUHIKO NINOMIYA, Department of Chemistry, University of Wisconsin, Madison, Wisconsin R. S. RIVLIN, Brown University, Providence, Rhode Island