United States. Department of Labor <br/><br/>
Wrecking and demolition operations 
by Department of Labor 
 - Washington  Government Printing Office  1961 
 - 10p. 
<br/><br/> Occupational hazards to young workers Report No. 15 
<br/><br/><label>Dewey Class. No.: </label>X2024x73 Un3