The support on underground workings in the coalfields of the south midlands and the south of England (North and south staffordshire, Cannock Chase, Shropshire, Leicestershire and south derbyshire, Warwickshire, forest of Dean, Bristol and somerset, and Kent)
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Bibliographic Information
The support on underground workings in the coalfields of the south midlands and the south of England (North and south staffordshire, Cannock Chase, Shropshire, Leicestershire and south derbyshire, Warwickshire, forest of Dean, Bristol and somerset, and Kent)
（Safety in mines research board paper, No. 44）
H. M. Stationery off., 1928
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