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| Carboniferous period (MichaelBurov); Carbon (MichaelBurov); Carboniferous (MichaelBurov) | |||
| carboniferous; Carbonic period | |||
| age of coal; age of ferns | |||
| the Carboniferous (пятый период палеозойской эры) | |||
| каменноугольный период: 5 a las frases, 5 temas |
| Cemento | 1 |
| Ferrocarril | 1 |
| General | 1 |
| Oceanografía y oceanología | 1 |
| Plantas de procesamiento de petróleo | 1 |