United States Department of the interior <br/><br/>
Synthetic liquid fuels  annual report of the secretary of the interior for 1951. pt.2 Oil from oil shale 

 -  United States Department of the interior  1952 
 - 86p. 
 - Bureau of mines report of investigation  No.4866 .
<br/><br/><label>Dewey Class. No.: </label>662.66  / N52.2