ID:DA19826196
Coward, Hubert Frank
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by H.F. Coward, R. V. Wheeler
H. M. Stationery off. 1929 Safety in mines research board paper No. 53
Available at 4 libraries
His Majesty's Stationery Office 1926 Safety in mines research board paper no. 19
by H. F. Coward, R. V. Wheeler
His Majesty's Stationery Office 1925 Safety in mines research board paper no. 8
Available at 3 libraries
