Helmkamp,George K. <br/><br/>
Selected experiments in organic chemistry / 
George K. Helmkamp and Harry W. Johnson. 
 - 2nd ed. 
 - San Francisco:  W. H. Freeman,  1968. 
 - 184 p. :  ill. ;  25 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chemistry, Organic--Laboratory manuals.