Third annual conference on materials for coal conversion and utilization  (Oct.10-12) at the National Bureau of Standards, Gaithersburg, Maryland 

 - Washington, D.C. :  United States Government Printing Office,  1978 
 - Various pagings ;  25 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Energy conversion<br/>Coal conversion
<br/><br/><label>Dewey Class. No.: </label>333.79