Richard A. Lupoff 
Circumpolar! [EPUB ebook] 
Twin Planets Book 1

ANTARCTIC SAVAGES – PREHISTORIC MASTODONS – FLYING FORTRESSES – PARALYSING RAY GUNS – GRYPHONS – WATER-WITCHES – LOST CONTINENTS – WONDERFUL FLYING MACHINES…AND MORE!Coming soon – the most fantastic contest ever conceived: An airplane race pitting Amelia Earhart, Charles Lindbergh and Howard Hughes against Manfred von Richthofen (the Bloody Red Baron), his kid brother Lothar and Princess Irina Lvova of Russia!Which team will be the first to complete the never-before-attempted round-the-poles flight?Warning: On this doughnut-shaped alternate Earth it is impossible to fly off the edge!