Bell, Louis. <br/><br/>
Telescope / 

 - New York :  McGraw Hill Book Company,  1922. 
 - ix, 287 p. :  ill. ;  21 cm. 
<br/><br/> Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Optical Instruments<br/>Magnification<br/>Focal Length
<br/><br/><label>Dewey Class. No.: </label>522.2  / BEL