| Answer | Crossword Clue |
|---|---|
| TULSA | Center of oil-producing region. |
| OPEC | Gp. of oil-producing nations |
| ECTOR | Oil-producing county of Texas. |
| OLIVES | Oil-producing fruits |
| SHALE | Oil--producing rock |
| SESAME | Oil-producing seed |
| SHALE | Oil-producing rock |
| OPEC | Oil-producing org. |
| SESAMES | Oil-producing plants |
| SHALES | Oil-producing rocks |
| IRAN | Oil-producing country |
| OLIVE | Oil-producing plant |
| IRAQ | Great oil-producing country. |
| OPEC | Mideast oil-producing group |
