Conference in the matter of pollution of lake Michigan and its tributary basin 

 - Washington, D. C. :  United States Government Printing Office,  1971- 
 - v. ;  28 cm. 
<br/><br/> Library has vol. 2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pollution--Environmental aspects--United States<br/>Environmental protection--United States
<br/><br/><label>Dewey Class. No.: </label>363.730973