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aerial aeronautics Air Service aircraft airplane airship altitude American Army Air Corps Atlantic aviation balloon barograph battle Byrd cabin Capt Captain carried City climbed Clipper clouds coast Colonel Lindbergh cosmic rays course earth enemy engine Escadrille Explorer feet field fire flew flight flyers flying France French gasoline German gliding gondola Greenland ground height helium Hubbard Medal hydrogen instruments Island land Lieut Lieutenant lines load looked machine medal ment miles an hour minutes morning motor mountain National Geographic Magazine National Geographic Society Navy night ocean Official Photograph oxygen Pacific parachute passengers pilot pounds pressure propeller radio Raoul Lufbery reached record ropes route Royal Flying Corps sail plane ship speed squadrons stratosphere take-off temperature tion trip turn U. S. Army U. S. Army Air United valve Wasserkuppe weather wind wing