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The coal miners' insecurity; facts about irregularity of employment in the bituminous coal industry in the United States
- "Bituminous coal industry in the United States"@en
- "The coal miners' insecurity; facts about irregularity of employment in the bituminous coal industry in the United States"@en
- "The coal miners' insecurity facts about irregularity of employment in the bituminous coal industry in the United States"@en