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National Coal Board Production Department
Diwydiant
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National Coal Board Production Department
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National Coal Board Production Department
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Some further developments in underground Belt Vulcanising (leaflet)
National Coal Board Production Department
2018.42/56
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National Coal Board Production Department
2018.42/103
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National Coal Board Production Department
2018.42/97
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National Coal Board Production Department
2018.42/131
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National Coal Board Production Department
2001.1/1045
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Drilling Equipment for Firedamp Drainage (booklet)
National Coal Board Production Department
2018.42/183
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Hydraulic Transport of Coal at Woodend Colliery (booklet)
National Coal Board Production Department
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