Nitrogen removal by ammonia stripping / 
by Thomas P. O'Farrell...[et. al.] 
 - Washington, D.C. :  U.S. Environmental Protection Agency,  1973 
 - vi, 23 p. :  ill. ;  28 cm. 
 - Environmental protection technology series .
<br/><br/> EPA-670/2-73-040  September 1973 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nitrogen removal--Congresses<br/>Sewage--Purification
<br/><br/><label>Dewey Class. No.: </label>628.357