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Year
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1981
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1967
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1981
Type
Text
2
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2
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Theses & Dissertations
2
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"application/pdf"
Subject:
"Coal trade"
Type:
"Text"
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Title
Date
Type
1
Case study of underground coal mining productivity in Utah
1981-12
Text
2
Government and labor: the coal industry, 1946-1947
1967-07
Text
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