Halse, George W. <br/><br/>
Oils and retortable materials : 

 - London :  Charles Griffin and Company,  1927. 
 - vi, 146 p. :  ill. ;  20  cm. 
<br/><br/> Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coal Utilization<br/>Torbanite Processing<br/>Cannel Coal<br/>Retortable Materials<br/>Fossil Fuels
<br/><br/><label>Dewey Class. No.: </label>665.4  / HAL