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Fourth [etc.] Progress Report ... to Carnegie Institute of Technology and United States Bureau of Mines, October 1931 to October, 1934 [etc.].

Carnegie Institute (PITTSBURGH). Carnegie Institute of Technology. Mining Advisory Board

出版	1934
URL	http://books.google.com.hk/books?id=wpL9MgEACAAJ&hl=&source=gbs_api