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National Coal Board Mining Department
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William Hodge & Chilver Ltd
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National Coal Board Mining Department
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Production and Productivity Bulletin (magazine)
National Coal Board Mining Department
Kelly & Kelly Ltd.
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National Coal Board Mining Department
William Hodge & Chilver Ltd
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National Coal Board Mining Department
2001.1/739
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National Coal Board Mining Department
William Hodge & Chilver Ltd
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National Coal Board Mining Department
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Control of Harmful Dust in Coal Mines (booklet)
National Coal Board Mining Department
Trafford Print
2001.1/814
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Diwydiant
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National Coal Board Mining Department
2018.164/17
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