Photograph Sources	American Institute of Physics Emilio Segré Visual Archives, Archive Photos, Argonne National Laboratory,  Aris Entertainment, Bettmann Archives, Department of Defense, Department of Energy, Earth Imaging, Roger Goldengay, Lawrence Berkeley Laboratory, Los Alamos National Laboratory, Photo from “March of Time” -  courtesy of SFM Entertainment and Time Warner, Inc.

Video Sources	Visual Concept Entertainment, Defense Special Weapons Agency, Los Alamos National Laboratory, The National Archives, NBC New Archives,  The WPA Film Library