Thirring, Hans <br/><br/>
Photowiderstände /  
Hans Thirring, Otto Paul Fuchs 
 - Leipzig :   J.A. Barth,  1939. 
 - viii, 186 p.  il., diag.  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CELULAS FOTOTELECTRICAS
<br/><br/><label>Universal Decimal Class. No.: </label>621.383