First published as two novelettes in "Science Fiction Adventures" magazine. "The Sundered Worlds" in Vol 5 #29 November 1962 and "The Blood Red Game" in Vol 6 #32 May 1963.
simultaneous first paperback library mmpb printings, first merkin edition
cover art unsigned, uncredited, may be by jack gaughan (suggested because of style)
cover price 50¢
160pp. including titles, indica etc.
refer to publishing history to see if carcass of copy held was canadadian- or merkin- printed.
no priority established nor liable to be, both stating first printing, november, 1966