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CKNO WLEDGMENTS FOR THE PHO TO GRAPHS Photograph of Detlev Wulf Bronk by Illustration Service, Rockefeller Institute Photograph of Vannevar Bush by Karsh Photograph of Rufus Cole by I. B. Havlenbeek Photograph of Wallace Osgood Fenn courtesy of the University of Rochester Photograph of Frank Lappin Horsfall by Illustration Service, Rockefeller Institute Photograph of Otto Laporte by John N. Richards, Sr. courtesy of the Department of State Portrait of Arnold Rice Rich by Paul Trebilcock 397