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BS 1747-7:1983

Methods for measurement of air pollution-Determination of mass concentration of sulphur dioxide in ambient air: Thorin spectrophotometric method
standard by BSI Group, 01/31/1983

BS 1016-19:1980

Methods for analysis and testing of coal and coke-Determination of the index of abrasion of coal
standard by BSI Group, 10/31/1980