Cecala, Andrew B. <br/><br/>
Impact of background sources on dust exposure of bag machine operator 
Cecala, Andrew B. 
 - Washington  Bureau of mines  1986 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CONTROL DE POLVOS EN LA MINA
<br/><br/><label>Universal Decimal Class. No.: </label>622.807