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BS

PDF Standards BS 1747-8:1986

Methods for measurement of air pollution-Determination of the mass concentration of nitrogen dioxide in ambient air: modified Griess-Saltzman method
standard by BSI Group, 07/31/1986

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BS

PDF Standards BS 1902-3-3.13:1985

Methods of testing refractory materials. General and textural properties-Measurement of corner and edge defects and other surface imperfections of refractory bricks and blocks (attributive properties) (method 1902-313)
standard by BSI Group, 03/29/1985

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