SF Encyclopedia Picture Gallery
Robert Silverberg. The Time-Hoppers (Garden City, New York: Doubleday and Company, 1967) [exp from "Hopper" (October 1956 Infinity): hb/Rudolph de Harak]
Image courtesy of Clute Science Fiction Library at Telluride
Robert Silverberg. The Time-Hoppers (Garden City, New York: Doubleday and Company, 1967) [exp from "Hopper" (October 1956 Infinity): hb/Rudolph de Harak]
Image courtesy of Clute Science Fiction Library at Telluride