I.C.S. Reference library 
International Correspondence school 
 - páginas discontinuas  23 cm. 
<br/><br/> Light distribution, switches, arc-light dynamos 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ciencias puras
<br/><br/><label>Dewey Class. No.: </label>000  / INT INT 1905