Shofner, Frederick M. <br/><br/>
Explicit calibration of the pills II system / 
by  Frederick M. Shofner 
 - Washington :  U.S. G.P.O.,  1973 
 - v, 28 p. :  ill. ;  28 cm. 
 - Environmental Protection Technology Series .
<br/><br/> September 1973  EPA-600/2-73-011 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental protection<br/>Environmentalism
<br/><br/><label>Dewey Class. No.: </label>363.7