SF Encyclopedia Picture Gallery
Emil Petaja. The Prism (New York: Ace Books, 1965) [dos: early version first appeared July 1965 Worlds of Tomorrow as "World of the Spectrum": pb/Kelly Freas]
From the collection of Roger Robinson
Emil Petaja. The Prism (New York: Ace Books, 1965) [dos: early version first appeared July 1965 Worlds of Tomorrow as "World of the Spectrum": pb/Kelly Freas]
From the collection of Roger Robinson