書誌事項

Technology, employment, and output per man in phosphate-rock mining, 1880-1937

by A. Porter Haskell, Jr. and O.E. Kiessling

(Report, no. E-7 . Mineral technology and output per man studies)

Works Progress Administration, National Research Project, 1938

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注記

Includes bibliographical references

"In cooperation with Department of the Interior, Bureau of Mines"

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  • Report

    Work Projects Administration, National Research Project

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