National standards for steamfitting apprenticeship including suggestions for putting national standards into operation in local communities. 
Prepared by National Joint Steamfitting Apprenticeship Committee, in cooperation with Federal Committee on Apprenticeship, approved by Heating, Piping, and Air Conditioning Contractors' National Association and the United Association of Journeyman Plumbers and Steamfitters. 
 - Washington,  U.S. Govt. Print. Off.,  1939. 
 - v, 11 p. incl. facsims.  27 cm. 
 - [U.S. Dept. of Labor. Division of Labor Standards] Bulletin  no. 28 .
<br/><br/> At head of title: United States Dept. of Labor ... Division of Labor Standards. 
<br/><br/><label>LCCN: </label>l  39000043  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Apprentices--United States.
<br/><br/><label>LC Class. No.: </label>HD4885.U5  / N28