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Academic Journal

Metal sealed cone bits reduce costs in abrasive drilling

  • Authors : Cuellar, V [Hughes Christensen Co., Maracaibo (Venezuela)]

  • Source: Oil and Gas Journal; (United States); 90:49

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Report

Forest succession in the Upper Rio Negro of Colombia and Venezuela

  • Authors : Tharp, M.

  • Source: Other Information: Thesis. Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted. Thesis. Submitted by J.G. Saldarriaga to Univ. of

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