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- catalog contributor b6805302.
- catalog created "1927.".
- catalog date "1927".
- catalog date "1927.".
- catalog dateCopyrighted "1927.".
- catalog extent "iii, 66 p.".
- catalog isPartOf "Bulletin of the U.S. Bureau of Labor Statistics, no.454.".
- catalog isPartOf "Bulletin of the United States Bureau of Labor Statistics ; 454.".
- catalog issued "1927".
- catalog issued "1927.".
- catalog language "eng".
- catalog publisher "Washington, Govt. print. off.,".
- catalog spatial "United States.".
- catalog subject "Coal miners United States.".
- catalog subject "Coal mines and mining United States.".
- catalog subject "Hours of labor United States.".
- catalog subject "Wages United States.".
- catalog title "Hours and earnings in bituminous coal mining, 1922, 1924, and 1926.".
- catalog type "text".