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Relation Between and Precision of Dust Counts (light- and Dark-field) from Simultaneous Impinger, Midget-impinger, Electric-precipitator, and Filter-paper Samples

Carlton Ernest BrownHelmuth Herman Schrenk

出版	U.S. Department of the Interior, Bureau of Mines, 1949
URL	http://books.google.com.hk/books?id=KBEZn0cQhQoC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN