| • coal formation | |
| कोयला: carbon coal collier brown coal lignite fuel | |
| शैलसमूह: formation rock formation | |
कोयला शैलसमूह अंग्रेज़ी में
[ koyala shailasamuh ]
| • coal formation | |
| कोयला: carbon coal collier brown coal lignite fuel | |
| शैलसमूह: formation rock formation | |
