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Google圖書搜尋
The Negro in the Bituminous Coal Mining Industry
Darold T. Barnum
Herbert Roof Northrup
Howard W. Risher
Richard D. Leone
出版
Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania
, 1970
ISBN
0812290526
9780812290523
URL
http://books.google.com.hk/books?id=lOi90AEACAAJ&hl=&source=gbs_api