Ruhemann, Martin,  1903- <br/><br/>
Power / 
Martin Ruhemann 
 - [London] :  Sigma Books Limited,  1946 
 - 123 p. :  ill. ;  19 cm. 
 - Sigma introduction to science ;  5 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Power (Mechanics)<br/>Heat-engines<br/>Fuel
<br/><br/><label>Dewey Class. No.: </label>621