Sommer, A . <br/><br/>
Photoelectric Cells /  Textual Documents 
A.Sommer. 
 - 1st ed. / 
 - London :  Methuen &Co.Ltd., ,  1946. 
 - viii,102p. ;  22cm.. 
<br/><br/>Index 
<br/><br/><label>Subjects--Index Terms: </label>Photoelectric Cells G-Physics 
<br/><br/><label>Dewey Class. No.: </label>537.89  / So 55 P