Automotive research and development and fuel economy : Hearings before the Committee on Commerce, United States Senate, Ninety-third Congress, first session, on S. 1055, to authorize a program of research and development of alternative propulsion systems for automotive vehicles in commerce, [and] S. 1903, to regulate commerce and conserve gasoline by improving motor vehicle fuel economy, and for other purposes, May 3, 4, 14 ; June 8, 14, and 21, 1973

"Automotive research and development and fuel economy : Hearings before the Committee on Commerce, United States Senate, Ninety-third Congress, first session, on S. 1055, to authorize a program of research and development of alternative propulsion systems for automotive vehicles in commerce, [and] S. 1903, to regulate commerce and conserve gasoline by improving motor vehicle fuel economy, and for other purposes, May 3, 4, 14 ; June 8, 14, and 21, 1973"