Watson, P.J. <br/><br/>
Survey of nuisance and biologically active dusts in metal and nonmetal mines 
Watson, P.J. 
 - Washington  Bureau of mines  1987 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA<br/>CONTROL DE POLVO DE MINAS
<br/><br/><label>Universal Decimal Class. No.: </label>622.807