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Postcard showing a U.S. Martin « MARS » bomber aircraft in flight above a rural landscape. The reverse details its technical specifications: length 37 m, height 11 m, 4 Wright-Duplex-Cyclone engines of 2 000 hp, maximum speed 4 000 km/h, maximum total weight 70 tonnes, range 7 000 km, and cargo capacity 5 000 kg. Publisher: Éditions Superphile, Paris.