Three American microscope builders. 

 - America :  Scientific Instrument division,  1945. 
 - 77 p. :  illus. ;  25 cm. 
<br/><br/> Open access. 
<br/><br/><label>LCCN: </label>463016  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Spencer, Charles Achilles--1813-1881.<br/>Tolles,Robert B--1825-1883.<br/>Spencer, Herbert Ruthven--1845-1900.