Billings, Roger E. <br/><br/>
Hydrogen from coal :  a cost estimation guidebook / 
Roger E. Billings. 
 - Tulsa, Okla. :  PennWell,  1983. 
 - 214 p. ;  23 cm. 
<br/><br/><label>ISBN: </label>087814210X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hydrogen as fuel.<br/>Coal gasification.