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- l22000308 contributor B12942967.
- l22000308 created "1922.".
- l22000308 date "1922".
- l22000308 date "1922.".
- l22000308 dateCopyrighted "1922.".
- l22000308 extent "iv, 63 p.".
- l22000308 issued "1922".
- l22000308 issued "1922.".
- l22000308 language "eng".
- l22000308 publisher "Washington, Govt. print. off.,".
- l22000308 spatial "United States.".
- l22000308 subject "Coal miners United States.".
- l22000308 subject "Coal mines and mining United States.".
- l22000308 subject "HD8051 .A62 no. 316".
- l22000308 subject "Hours of labor United States.".
- l22000308 subject "Wages United States.".
- l22000308 title "Hours and earnings in anthracite and bituminous coal mining.".
- l22000308 type "text".