Houstoun, R. A.  <br/><br/>
A treatise on light. / 
R. A. Houstoun. 
 - 7th ed. 
 - New York :  Longmans,  1949. 
 - xi 528 p. :  ill. ;  22 cm. 
<br/><br/> Includes index. 
<br/><br/>324  324 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Light & related radiations.
<br/><br/><label>Dewey Class. No.: </label>535 / H818t