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A CKNO WLEDGMENTS FOR THE PHO TO GRAPHS Photograph of Eliot Blackwelder by Berton Crandall, Palo Alto, California Photograph of Edward Uhler Condon courtesy of the Photographic Department University of Colorado, Boulder Photograph of Carl Henry Eckart by Glasheen Graphics, La Jolla, California Photograph of Samuel Kirkland Lothrop by Nikolas Muray Photograph of Donald Dexter Van Slyke courtesy of the Brookhaven National Laboratory