Federal motor vehicle safety standard no. 121--air brake systems :  hearings before the Subcommittee on Governmental Efficiency and the District of Columbia of the Committee on Governmental Affairs, United States Senate, Ninety-fifth Congress, second session 

 - Washington :  U.S. Print. Off.,  1978. 
 - iii, 683 p. :  ill. ;  23 cm. 
<br/><br/> Hearings held October 31, 1978 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air-brakes.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Motor vehicles--Brakes.
<br/><br/><label>Dewey Class. No.: </label>343.730944