International Organization for Standardization <br/><br/>
ISO: 9931 - 1991; Coal - Sampling of pulverized coal conveyed by gases in direct fired coal systems 

 - 1.0 
 - Geneva  International Organization for Standardization  1991 
 - 18 
<br/><br/> Taken print out fromCD 
<br/><br/><label>Universal Decimal Class. No.: </label> /