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1940 (2)

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Mechanization, employment, and output per man in bituminous-coal mining
Authors: Hotchkiss, Willard E. --- National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques (U.S.) --- United States.
Year: 1940 Publisher: Philadelphia, Pennsylvania : Work Projects Administration, National Research Project : Department of the Interior, Bureau of Mines,

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Bituminous coal industry --- Bituminous coal mines and mining --- Coal miners --- Coal-mining machinery --- Coal miners. --- Coal-mining machinery. --- Labor productivity --- Effect of technological innovations on --- United States.

Book

Mechanization, employment, and output per man in bituminous-coal mining
Authors: Hotchkiss, Willard E. --- National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques (U.S.) --- United States.
Year: 1940 Publisher: Philadelphia, Pennsylvania : Work Projects Administration, National Research Project : Department of the Interior, Bureau of Mines,

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Abstract

Keywords
Bituminous coal industry --- Bituminous coal mines and mining --- Coal miners --- Coal-mining machinery --- Labor productivity --- Effect of technological innovations on --- United States.

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