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Mineral Technology and Output Per Man Studies

National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques (U.S.)

出版	Works Progress Administration, National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques, 1937
URL	http://books.google.com.hk/books?id=OlQjAQAAMAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN