Left image by Bettman/Corbis; Right Photograph by John Kernick
Left image Courtesy of The Library of Virginia
Image Courtesy of The Library Company of Philadelphia
Left Image Courtesy of The Granger Collection; Right photograph by Cannon Brown
Images Courtesy of Michigan State University
Image Courtesy of NYPL Digital Gallery, The New York Public Library
Left Photograh by Time & Life Pictures/Getty; Right Photograph Courtesy of NYPL Digital Gallery, The New York Public Library
Photograph Courtesy of the Fred Harvey House
Image Courtesy of NYPL Digital Gallery, The New York Public Library
Photograph by B.M. Clinedinst/ Corbis
Image Courtesy of NYPL Digital Gallery, The New York Public Library
Left Image Courtesy of The Kellogg Company; Right Photograph by Corbis
Photograph by Bettmann/Corbis
Left Image Courtesy of The Hershey Company; Right Photograph by Bettmann/Corbis
Left Photograph by AP Photo; Right Photograph by Bettmann/Corbis
Left Photograph by Bettman/Corbis; Right Photograph Courtesy of Birdseye
Photographs by Time & Life Pictures/Getty
Photograph by Time & Life Pictures/Getty
Left Photograph by Time & Life Pictures/Getty; Right Photograph by AP Photo/Rich Kareckas
Photograph by Time & Life Pictures/Getty
Photograph Courtesy of University of Minnesota
Photograph by Arnold Newman/ Getty
Photograph by Chester Higgins Jr/ Redux
Photograph by Anna Lappé