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Jasperoids of the Pando Area, Eagle County, Colorado
Tom Gray LoveringAllen Van Heyl
出版U.S. Government Printing Office, 1980
URLhttp://books.google.com.hk/books?id=OHAShuTHGugC&hl=&source=gbs_api
EBookFULL_PUBLIC_DOMAIN
註釋Tungsten-rich outcrops may indicate concealed tungsten and beryllium deposits.