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Injury experience in coal mining, 1959 :analysis of mine safety factors, related employment, and production data

Injury experience in coal mining, 1958 :analysis of mine safety factors, related employment, and production data

Injury experience in coal mining, 1960 :analysis of mine safety factors, related employment, and production data

Injury experience in coal mining, 1961 :analysis of mine safety factors, related employment, and production data

Injury experience in coal mining, 1962


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