Detailed coal exploration in Napal, Peranap, Riau, Sumatera, Indonesia
Artikel Jurnal
Mineral matter and its identification in Indonesian coal
Artikel Jurnal
Proceedings of international conference on mining and the environment : Bandung, Indonesia, July 2-4, 1991
Department of Mining Engineering, ITB , 1992
Buku Referensi
Review of geological and mining condition at Ombilin, Indonesia, in comparison with those at other collieries, in Australia and the United Kingdom
Artikel Jurnal
Speare, M. Edmund, author
The Coal industry
Bellman , 1957
Buku Teks
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