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Injury Experience in Coal Mining, 1949: Detailed Analysis of Factors Influencing Mine Safety and Related Employment, Production and Productivity Data
Injury Experience in Coal Mining, 1950: Analysis of Mine Safety Factors, Related Employment, and Production Data
Injury Experience in Coal Mining, 1952: Analysis of Mine Safety Factors, Related Employment, and Production Data
Injury Experience in Coal Mining, 1951: Analysis of Mine Safety Factors, Related Employment, and Production Data
Injury experience in coal mining, 1953-54 :analysis of mine safety factors, related employment, and production data