Report from the National Academy of Sciences  hearing before the Subcommittee on Environmental Pollution of the Committee on Public Works, United States Senate, Ninety-third Congress, second session, September 6, 1974. 

 - Washington  U.S. Govt. Print. Off.  1974. 
 - iii, 43 p.  23 cm. 
<br/><br/> "Serial no. 93-H56." 
<br/><br/><label>LCCN: </label>74603300  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air--Pollution--Law and legislation--United States.<br/>Automobile exhaustgas.<br/>Automobiles--Motors--Exhaust gas.
<br/><br/><label>LC Class. No.: </label>KF26  / .P836 1974c 
<br/><br/><label>Dewey Class. No.: </label>344/.73/0463 
<br/><br/><label>Gov. Doc. Class. No.: </label>Y 4.P 96/10:93-H 56