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- a41004380 contributor B12841971.
- a41004380 contributor B12841972.
- a41004380 contributor B12841973.
- a41004380 created "[1940]".
- a41004380 date "1940".
- a41004380 date "[1940]".
- a41004380 dateCopyrighted "[1940]".
- a41004380 description "Includes bibliographical references.".
- a41004380 extent "xiii, 158 p. :".
- a41004380 isPartOf "Mineral technology and output per man studies ; report no. E-ll".
- a41004380 issued "1940".
- a41004380 issued "[1940]".
- a41004380 language "eng".
- a41004380 publisher "Philadelphia, Pa. : Work Projects Administration, National Research Project in cooperation with Dept. of the Interior, Bureau of Mines,".
- a41004380 spatial "United States.".
- a41004380 subject "Miners United States.".
- a41004380 subject "Rock-drills.".
- a41004380 subject "TN23 .N35 no. E-11".
- a41004380 title "Rock drilling / by C.E. Nighman and O.E. Kiessling.".
- a41004380 type "text".