Model 4-AT-B, all metal trimotor monoplane, C/N4-AT-20, NC-5093, owned by Rapid City Air Lines, Inc. Photographed: at Dupont Field, Dupont, Colo., August 14, 1928.
Airplanes--Pictorial works--1920-1930.; Aircraft--Colorado--Dupont--1928.; Ford Motor Company.