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You searched for: Creator Personal Names Leonard, Joseph W. Remove constraint Creator Personal Names: Leonard, Joseph W. All Creators Humphreys, Kenneth King. Remove constraint All Creators: Humphreys, Kenneth King. All Subjects Mining engineering. Remove constraint All Subjects: Mining engineering. Subject Topical Mine safety. Remove constraint Subject Topical: Mine safety. Subject Topical Mineral industries--Economic aspects. Remove constraint Subject Topical: Mineral industries--Economic aspects.

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