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| 晚石炭世煤系 (英国用法); 煤层组【系】 | |||
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| 晚石炭统煤系欧洲，特别是英国用法 | |||
| 煤床 | |||
| 煤层组; 煤系 | |||
| 煤层 | |||
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| 煤系 | |||
| English thesaurus | |||
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| CM (Vosoni) | |||
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Coal Measures : 10 phrases in 2 subjects |
| Oil / petroleum | 3 |
| Technology | 7 |
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