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| solid fuel | |||
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| solid fuels | |||
| combustibile solido: 34 phrases in 13 subjects |
| Astronomy | 3 |
| Chemistry | 1 |
| Coal | 3 |
| Electronics | 2 |
| Energy industry | 9 |
| Environment | 2 |
| General | 4 |
| Metallurgy | 1 |
| Natural sciences | 2 |
| Patents | 2 |
| Research and development | 2 |
| Statistics | 2 |
| Transport | 1 |