Barr, J.R. <br/><br/>
Principles of direct-current elelcltrical engineering 
Barr, J.R. 
 -  1908 
<br/><br/> Illus. 
<br/><br/><br/>In English 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric
<br/><br/><label>Dewey Class. No.: </label>Olivai, 1  1908