Circumpolar!
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Circumpolar! is a novel by Richard A. Lupoff published in 1984.
Circumpolar! is a novel in which an alternative history is depicted with vastly different geography: A highly flattened disklike "donut" topology. It describes a Great Air Race to circumnavigate the Earth by traveling through the "polar hole" (hence the title), around the "underside" of the Earth to its "rim", and back to its starting-point. The race features the von Richthofens competing against Charles Lindbergh and Howard Hughes.
