Hardwick, W.R. <br/><br/>
Open-Pit Copper Mining Methods And Practices, Copper Cities Division, Miami Copper Co., Gila County, Arizona 

 -  SEGEMARU.S.A.  1960 
<br/><br/> Departamento Del Interior De Los Estados Unidos, Circular 7985 
<br/><br/><label>Subjects--Index Terms: </label>Mineral/es: Cobre