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Technology, Employment, and Output Per Man in Phosphate-rock Mining, 1880-1937

A. Porter HaskellOscar Edward KiesslingNational Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques (U.S.)

出版	Works Progress Administration, National Research Project, 1938
URL	http://books.google.com.hk/books?id=zbhNAQAAMAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN