| 213115 |
Stripping overburden services for nonmetallic minerals mining (except fuels) on a contract basis |
| 213115 |
Test drilling for nonmetallic minerals mining (except fuel) on a contract basis |
| 221111 |
Electric power generation, hydroelectric |
| 221111 |
Hydroelectric power generation |
| 221111 |
Power generation, hydroelectric |
| 221112 |
Electric power generation, fossil fuel (e.g., coal, oil, gas) |
| 221112 |
Power generation, fossil fuel (e.g., coal, gas, oil), electric |
| 221113 |
Electric power generation, nuclear |
| 221113 |
Power generation, nuclear electric |
| 221114 |
Electric power generation, solar |