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- a41004372 contributor B12841955.
- a41004372 contributor B12841956.
- a41004372 contributor B12841957.
- a41004372 created "[1937]".
- a41004372 date "1937".
- a41004372 date "[1937]".
- a41004372 dateCopyrighted "[1937]".
- a41004372 description "Includes bibliographical references.".
- a41004372 extent "ix, 19 p. :".
- a41004372 isPartOf "Mineral technology and output per man studies ; report no. E-3".
- a41004372 issued "1937".
- a41004372 issued "[1937]".
- a41004372 language "eng".
- a41004372 publisher "Philadelphia, Pa. : Works Progress Administration, National Research Project and Dept. of the Interior, Bureau of Mines,".
- a41004372 spatial "United States.".
- a41004372 subject "Conveying machinery.".
- a41004372 subject "Hoisting machinery.".
- a41004372 subject "Mineral industries United States.".
- a41004372 subject "Mining machinery.".
- a41004372 subject "TN23 .N35 no. E-3".
- a41004372 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.".
- a41004372 type "text".