Crammer, J L . <br/><br/>
Science News 18 /  Textual Documents 
J L Crammer. 
 - 1st ed / 
 - Middlesex :  Penguin Books Ltd ,  1950. 
 -  index ; 
<br/><br/><label>Dewey Class. No.: </label>505  / Cr 84 Sc