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Injury experience in coal mining, 1964 :analysis of mine safety factors, related employment, and production data

Injury experience in coal mining, 1965 :analysis of mine safety factors, related employment, and production data

Injury experience in coal mining, 1966 :analysis of mine safety factors, related employment, and production data

Injury experience in coal mining, 1967

Injury experience in coal mining, 1968

Injury experience in coal mining, 1970

Injury experience in coal mining, 1969


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