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Analyses of Mine and Car Samples of Coal Collected in the Fiscal Years 1916 to 1919
Arno Carl FieldnerWalter Alfred SelvigJames Washington Paul
出版U.S. Government Printing Office, 1922
URLhttp://books.google.com.hk/books?id=s2ByDwZa994C&hl=&source=gbs_api
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