| SIC | Description |
|---|---|
| 131 | Crude Petroleum and Natural Gas | 1311 | Crude petroleum and natural gas | 132 | Natural Gas Liquids | 1321 | Natural gas liquids | 138 | Oil and Gas Field Services | 1381 | Drilling oil and gas wells | 1382 | Oil and gas exploration services | 1389 | Oil and gas field services, nec |