Use hammers the safe way. 

 - [Washington,  U.S. Govt. Print. Off.,  1951] 
 - 13 p.  illus.  23 cm. 
 - Its Bulletin,  no. 127 .
 - Bulletin (United States. Bureau of Labor Standards) ;  127. .
<br/><br/><label>LCCN: </label>l  51000138  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hammers.<br/>Industrial accidents.
<br/><br/><label>LC Class. No.: </label>TJ1201.H3  / U5 1951 
<br/><br/><label>Dewey Class. No.: </label>621.97