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X -ray emission X : 42 phrases in 14 subjects |
| Agriculture | 1 |
| Aviation | 1 |
| Chemistry | 2 |
| Earth sciences | 7 |
| Ecology | 2 |
| Electronics | 8 |
| Engineering geology | 1 |
| Geology | 3 |
| Geophysics | 1 |
| Metallurgy | 7 |
| Physics | 1 |
| Space | 2 |
| Technology | 5 |
| Water resources | 1 |
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