| Answer | Crossword Clue |
|---|---|
| OXY | Petroleum company, informally |
| AMOCO | Petroleum company |
| REFINERY | Petroleum company |
| HESS | Petroleum company |
| HESS | Amerada ... (petroleum company) |
| HESS | Amerada ... (bygone petroleum company) |
| AMOCO | Company bought by British Petroleum |
