Study on the Tonstein in Permo-Carboniferous Coal Seams in Northern China[J]. COAL GEOLOGY & EXPLORATION, 1988, 16(1): 10-12.
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Citation:
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Study on the Tonstein in Permo-Carboniferous Coal Seams in Northern China[J]. COAL GEOLOGY & EXPLORATION, 1988, 16(1): 10-12.
|
Study on the Tonstein in Permo-Carboniferous Coal Seams in Northern China[J]. COAL GEOLOGY & EXPLORATION, 1988, 16(1): 10-12.
|
Citation:
|
Study on the Tonstein in Permo-Carboniferous Coal Seams in Northern China[J]. COAL GEOLOGY & EXPLORATION, 1988, 16(1): 10-12.
|
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