Tomb, Thomas F. <br/><br/>
Standard calibration and maintenance procedures for wt test meters and coal mine respirable dust samplers 
Tomb, Thomas F. 
 - Washington  Department of interior  1978 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CONTROL DE POLVO EN LAS MINAS<br/>CONTROL DE LAS CONDICIONES AMBIENTALES
<br/><br/><label>Universal Decimal Class. No.: </label>622.807