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Petroleum and natural gas industries. Progressing cavity pump systems for artificial lift. Part 2. Surface-drive systems. General technical requirements
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Concentrated kaolin. Method for determination of adsorption index
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Methods for the petrographic analysis of coals. Part 5. Method of determining microscopically the reflectance of vitrinite
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Peat. Methods for the determination of the disintegration degree
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Niobium pentoxide. Method for the determination of fluor content
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