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shale : 61 phrases in 15 subjects |
Chemistry | 2 |
Coal | 3 |
Construction | 10 |
Earth sciences | 9 |
Environment | 2 |
General | 7 |
Industry | 2 |
International Monetary Fund | 1 |
Life sciences | 2 |
Metallurgy | 9 |
Natural resourses and wildlife conservation | 6 |
Oil / petroleum | 4 |
Statistics | 1 |
Technology | 2 |
Transport | 1 |