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Coal-Mine Fatalities in May, 1926
The National Safety Competition of 1929
Coal-Mine Fatalities in April, 1931
Coal-Mine Fatalities in December, 1930
Coal-Mine Fatalities in February, 1931
Coal-Mine Fatalities in June, 1931
Coal-Mine Fatalities in May, 1931
Coal-Mine Fatalities in March, 1931