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- catalog contributor b6486285.
- catalog contributor b6486286.
- catalog contributor b6486287.
- catalog contributor b6486288.
- catalog contributor b6486289.
- catalog contributor b6486290.
- catalog contributor b6486291.
- catalog created "[1937]".
- catalog date "1937".
- catalog date "[1937]".
- catalog dateCopyrighted "[1937]".
- catalog description "Includes bibliographical references.".
- catalog extent "ix, 19 p. :".
- catalog isPartOf "Mineral technology and output per man studies ; report no. E-3".
- catalog issued "1937".
- catalog issued "[1937]".
- catalog language "eng".
- catalog publisher "Philadelphia, Pa. : Works Progress Administration, National Research Project and Dept. of the Interior, Bureau of Mines,".
- catalog spatial "United States.".
- catalog subject "Conveying machinery.".
- catalog subject "Hoisting machinery.".
- catalog subject "Mineral industries United States.".
- catalog subject "Mining machinery.".
- catalog subject "TN23 .N35 no.E-3".
- catalog title "Mechanization trends in metal and nonmetal mining as indicated by sales of underground loading equipment / by L.N. Plein, F.E. Berquist, and F.G. Tryon.".
- catalog type "text".