Eissler, M. <br/><br/>
The cyanide process for the extraction of gold and its practical applications on the witwatersrand gold frields in south africa / 
By m. eisslaer 
 - xvi, 93 páginas 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Endurecimiento superficial
<br/><br/><label>LC Class. No.: </label>TN767  / E57