POWELL DUFFRYN TECHNICAL SERVICES LIMITED <br/><br/>
Integrated Scheme for the Utilisation and Processing of the Lignite 

 - London, 1957 
 - 2Vols. + Supplement 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Production Economics
<br/><br/><label>Dewey Class. No.: </label>338.4766262  / POW.I