Notes: • Copyright MCMI, MCMXXVIII No other statements of publication or printing • Year obtained by comparison of other Dell editions/#s • The artist is not credited, no visible signature. Vintage Paperback Archives attributes the cover to Gregg. However, Possible Futures: Science Fiction Art from the Frank Collection attributes it to Earl Sherwan with lettering by his wife, Marquerite. As the Franks bought the original artwork, this would be more reliable attribution. • There is no price on the book, publisher's ad on the last page offers other Dells up to #200 each for 25¢ • Tuck agrees on price and publication year. • A "Mapback" edition, see here for the back cover.