ACKNOWLEDGMENTS FOR THE PHOTOGRAPH
FREDERIC W. ALBAUGH, courtesy of PNL Photography, Richland, Washington
MILO C. BELL, by Images by Edy
JOHN D. CAPLAN, by Leo Knight Photography, Southfield, Michigan
EUGENE G. FUBINI, by Fabian Bachrach
JOHN E. GRAY, by Fabian Bachrach
HANS LIST, by Foto-Furgler, Graz, Austria
NICHOLAS J. HOFF, courtesy of the News and Public Service Office, Stanford University
BURGESS H. JENNINGS, by Nickerson, Evanston, Illinois
WERNER STUMM, courtesy of the Swiss Federal Institute of Technology
FRANK WHITTLE, courtesy of the Smithsonian Institution
CHIA-SHUN YIH, courtesy of the University Of Michigan
CHARLES A. ZRAKET, by Fabian Bachrach