Bituminous-coal from Arizona, USA
USA | |
| Tenney, J.B. (1928), The mineral industries of Arizona, AZ Bur. Mines Bull. 125: 111-112. |
| Tenney, J.B. (1928), The Mineral Industries of Arizona, AZ Bur. Mines Bull. 125: 111. |
USA | |
| Tenney, J.B. (1928), The mineral industries of Arizona, AZ Bur. Mines Bull. 125: 111-112. |
| Tenney, J.B. (1928), The Mineral Industries of Arizona, AZ Bur. Mines Bull. 125: 111. |