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Productivity Trends, 1935 to 1951
United States. Bureau of Labor Statistics
其他書名
Bituminous Coal Mining Industry
出版United States Department of Labor, Bureau of Labor Statistics, 1952
URLhttp://books.google.com.hk/books?id=L1JKAQAAMAAJ&hl=&source=gbs_api
EBookFULL_PUBLIC_DOMAIN