Armstrong, F. E. <br/><br/>
Coal mine dust incombustibles content analyzer using a gamma-ray backscatter technique 
Armstrong, F. E. 
 - Washington  Bureau of mines  1974 
 - 10 p. 
 - RI 7946 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA<br/>MINING
<br/><br/><label>Subjects--Index Terms: </label>EXPLOSIONES DE MINAS POLVOS DE MINA MINAS DE CARBON MINE EXPLOSIONS MINE DUSTS COAL MINES 
<br/><br/><label>Universal Decimal Class. No.: </label>622