Ludwig, Oswald A. <br/><br/>
Metalwork :  technology and practice / 
Oswald A. Ludwig ; rev. by Willard J. McCarthy. 
 - [5th ed.] 
 - Bloomington, Ill. :  McKnight & McKnight,  c1969. 
 - xiv, 630 p. :  ill. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Machine-shop practice.<br/>Metal-work