Study on the Tonstein in Permo-Carboniferous Coal Seams in Northern China

Study on the Tonstein in Permo-Carboniferous Coal Seams in Northern ChinaJ. COAL GEOLOGY & EXPLORATION, 1988, 16(1): 10-12.

Citation:

Study on the Tonstein in Permo-Carboniferous Coal Seams in Northern ChinaJ. COAL GEOLOGY & EXPLORATION, 1988, 16(1): 10-12.

Citation:

Study on the Tonstein in Permo-Carboniferous Coal Seams in Northern ChinaJ. COAL GEOLOGY & EXPLORATION, 1988, 16(1): 10-12.

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