Hardwick, W.R.
Open-Pit Mining Methods And Practices At The Chino Mines Division, Kennecott Copper Corp., Grant Country, N.Nex. - SEGEMARU.S.A. 1958
Departamento Del Interior De Los Estados Unidos, Circular 7837
Open-Pit Mining Methods And Practices At The Chino Mines Division, Kennecott Copper Corp., Grant Country, N.Nex. - SEGEMARU.S.A. 1958
Departamento Del Interior De Los Estados Unidos, Circular 7837