From dung and wood to coal 

 - Delhi :  Coal Utilization Council,  1967 
 - 60 p. ;  25 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Farm manure<br/>Fuel<br/>Manures<br/>Force and energy
<br/><br/><label>Dewey Class. No.: </label>531.875