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- catalog contributor b6401962.
- catalog created "1952.".
- catalog date "1952".
- catalog date "1952.".
- catalog dateCopyrighted "1952.".
- catalog extent "xi, 96 p.".
- catalog isPartOf "Industrial Research Dept., Wharton School of Finance and Commerce, University of Pennsylvania. Research report no. 13".
- catalog isPartOf "Research report (Wharton School. Industrial Research Department) ; no. 13.".
- catalog issued "1952".
- catalog issued "1952.".
- catalog language "eng".
- catalog publisher "Philadelphia, Industrial Research Dept., Wharton School of Finance and Commerce, Universiry of Pennsylvania,".
- catalog spatial "Pennsylvania.".
- catalog subject "Coal mines and mining Pennsylvania.".
- catalog subject "HD9547.P4 J3".
- catalog subject "Labor productivity Pennsylvania.".
- catalog title "Measuring productivity in coal mining; a case study of multiple input measurement at the county level in Pennsylvania, 1919-1948.".
- catalog type "text".