Environmental protection research catalog 

 - Washington, D.C. :  United States Environmental Protection Agency,  1972 
 - Various pagings ;  26 cm. 
<br/><br/> Prepared by the Smithsonian science 
<br/><br/><label>Subjects--Topical Terms: </label><br/>United States. Environmental policy 
<br/><br/><label>Dewey Class. No.: </label>333.7