00471cac a22001693a 4500 ltf96012222 DLC 20260227111555.0 040527m19191971txua 000 0 eng ltf96012222 DLC DLC HS3313.Z95 A4-Z Merit badge series. [Aerodynamics--Aviation] New York, N.Y. : Boy Scouts of America, [1919-<1971>] v. ill. 21 cm. Boy Scouts of America. 37763 37763