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- catalog contributor b761854.
- catalog contributor b761855.
- catalog created "1961.".
- catalog date "1961".
- catalog date "1961.".
- catalog dateCopyrighted "1961.".
- catalog description "Bibliography: p. 133-137.".
- catalog extent "ii, 137 p. :".
- catalog isPartOf "Bulletin ; no. 1305".
- catalog isPartOf "Bulletin of the United States Bureau of Labor Statistics ; 1305.".
- catalog issued "1961".
- catalog issued "1961.".
- catalog language "eng".
- catalog publisher "Washington, D.C. : U.S. Dept. of Labor, Bureau of Labor Statistics : For sale by the Supt. of Docs., U.S. G.P.O.,".
- catalog spatial "United States.".
- catalog subject "Bituminous coal United States.".
- catalog subject "Coal trade United States.".
- catalog subject "Technological innovations United States.".
- catalog title "Technological change and productivity in the bituminous coal industry, 1920-60.".
- catalog type "text".