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There's actually a report on this proposal somewhere, or at least an AIAA paper. I always thought that they had the coolest artwork--all those black and white images you see in the magazine are actually color paintings (but why the green skies?), and the artwork was so good that it later showed up in a National Geographic book on space in the mid-1970s. But it's also not a workable design--that spacecraft could not have made it to the surface of Mars intact.