Wahl, Arthur Munzenmaier  1901- <br/><br/>
Mechanical springs /  
A. M. Wahl ... 
 - 1st ed. 
 - Cleveland, O.:   Penton Publishing Company,  1944. 
 - xi, 435 p.  illus., diagrs.  24 cm. 
 - [Machine design series] .
<br/><br/><label>Universal Decimal Class. No.: </label>621.8-11