CLAY (Reginald S) <br/><br/>
Treatise on practical light 

 - London  Macmillan & Co. Ltd.  1911 
 - xv,519 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Treatise<br/>practical<br/>on<br/>light
<br/><br/><label>Dewey Class. No.: </label>534/27