109 resultados para Coal mining
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Mode of access: Internet.
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"October 1992."
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"IMSRP-IV."
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"February 1983."
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Mode of access: Internet.
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Mode of access: Internet.
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Project no.: 80.214.
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Cover title.
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Includes bibliographical references.
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"ILENR/RE-PR-92/01."
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Cover title.
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Chiefly tables.
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Mode of access: Internet.
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Mode of access: Internet.
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Mode of access: Internet.