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Description:00 53 51 00 Aviation. The 20s. Assembly of several series of plane. Transport, communication. Close-up limps in letters, development of the service mail by the airs, planes. Plane mail went out of a hangar. Post-office employees put bags of letters in plane. Takeoff of the plane. The plane allows also to the vulcanologists to study volcanoes, smoked goes out of the crater far off. Earthquake, geology, volcano in eruption. Thick white smoke goes out of the crater. The other plane glances through the American canyons, the range of rocky mountains. Planes allow to the scientists to make big headaways in their searches. Plane glances through river in canyon.
