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Directionally Controlled Drilling to Horizontally Intercept Selected Strata, Upper Freeport Coalbed, Green County, Pa
William P. DiamondDavid C. OylerH. H. Fields
出版Department of the Interior, Bureau of Mines, 1977
URLhttp://books.google.com.hk/books?id=lFHt7jndW3kC&hl=&source=gbs_api
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