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Analyses of Coals in the United States with Descriptions of Mine and Field Samples Collected Between July 1, 1904 and June 30, 1910
Nathaniel Wright Lord
出版U.S. Government Printing Office, 1913
URLhttp://books.google.com.hk/books?id=itjTuq-mFYkC&hl=&source=gbs_api
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