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Daily Tonnage Output of the Pick Miner1 By ETHELBERT STEWART, United Stated Commissioner of Labor Statistics. production per man per day expressed in tonnage of coal is too commonly presented in statistical
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Document Date: 2016-08-12 06:47:03
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Daily Tonnage Output of the Pick Miner1 By ETHELBERT STEWART, United Stated Commissioner of Labor Statistics. production per man per day expressed in tonnage of coal is too commonly presented in statistical