Description: Polar explorers.
Comment: The Ace 1969 first edition though utilized artwork by Leo and Diane Dillon. The registration tapes on the artwork indicate though that this was used in some capacity. My theory is that it was used as an advertising piece in an Ace catalogue aimed at bookdealers spotlighting new, or upcoming, releases. The book, for those who've not read it (myself included) is a milestone is science fiction literature.