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- catalog contributor b6310000.
- catalog contributor b6310001.
- catalog created "1923]".
- catalog date "1923".
- catalog date "1923]".
- catalog dateCopyrighted "1923]".
- catalog extent "1 p. l., 253 p. incl. tables.".
- catalog issued "1923".
- catalog issued "1923]".
- catalog language "eng".
- catalog publisher "[Washington,".
- catalog spatial "United States.".
- catalog subject "Bituminous coal.".
- catalog subject "Coal miners United States.".
- catalog subject "Coal mines and mining United States.".
- catalog subject "United Mine Workers of America.".
- catalog title "Comparative efficiency of labor in the bituminous coal industry under union and non-union operation. Submitted to the United States Coal commission by the Bituminous operators' special committee, September 10, 1923.".
- catalog type "text".