Roark, R. C <br/><br/>
A digest of information on hexaethyl tetraphosphate  / 
R. C. Roark 
 - Washington  :   Department of Agriculture 
 - 12 h. 
 - EUA. Dept. of Agriculture E-721 .
<br/><br/><label>LCCN: </label>203034 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Insecticidas