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{ ?s ?p Mechanization, employment, and output per man in bituminous-coal mining.. }
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"
Mechanization, employment, and output per man in bituminous-coal mining.
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.
catalog
isFormatOf
"
Mechanization, employment, and output per man in bituminous-coal mining.
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.
catalog
relation
"
Mechanization, employment, and output per man in bituminous-coal mining.
"
.
