 |
| shale: 45 phrases in 17 subjects |
| Chemistry | 6 |
| Coal | 2 |
| Drilling | 6 |
| Earth sciences | 7 |
| Electronics | 1 |
| Environment | 2 |
| General | 5 |
| Geology | 2 |
| Industry | 2 |
| International Monetary Fund | 2 |
| Life sciences | 2 |
| Mineralogy | 1 |
| Mining | 1 |
| Oil / petroleum | 2 |
| Statistics | 1 |
| Technology | 2 |
| Transport | 1 |