Dryden, I. G. C.    1910- <br/><br/>
Carbonization and hydrogenation of coal /    
by I. G. C. Dryden. 
 - New York :   United Nations,   1973. 
 - xi, 137 p. :    ill. ;    24 cm. 
<br/><br/>  At head of title : United Nations Industrial Development Organizatio n, Vienna. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coal --Carbonization.------<br/>Coal liquefaction.--Carbonization.------