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Creator Personal Names
Humphreys, Kenneth King.
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Creator Personal Names
Leonard, Joseph W.
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All Creators
Humphreys, Kenneth King.
Remove constraint All Creators: Humphreys, Kenneth King.
All Creators
Leonard, Joseph W.
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Subject Topical
Mineral industries--Economic aspects.
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Subject Topical
Mineral industries--Safety measures.
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Subject Topical
Mining engineering.
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