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ISO 4176:1981Fertilizers - Determination of nitrate nitrogen content - Nitron gravimetric methodstandard by International Organization for Standardization, 04/01/1981
ISO 6629:1981Chromium ores and concentrates -- Methods of chemical analysis -- General instructionsstandard by International Organization for Standardization, 04/01/1981
ISO 4718:1981 [ Withdrawn ]Oil of lemongrass (Cymbopogon flexuosus)standard by International Organization for Standardization, 04/01/1981
ISO 6384:1981Surface active agents -- Technical ethoxylated fatty amines -- Methods of analysisstandard by International Organization for Standardization, 04/01/1981
ISO 6584:1981Cleaning equipment for air and other gases -- Classification of dust separatorsstandard by International Organization for Standardization, 03/01/1981
ISO 6327:1981Gas analysis -- Determination of the water dew point of natural gas -- Cooled surface condensation hygrometersstandard by International Organization for Standardization, 03/01/1981
ISO 6303:1981Pressure vessel steels not included in ISO 2604, Parts 1 to 6 - Derivation of long-time stress rupture propertiesstandard by International Organization for Standardization, 03/01/1981
ISO 6727:1981Road vehicles - Motorcycles - Symbols for controls, indicators and telltalesstandard by International Organization for Standardization, 03/01/1981
ISO 697:1981Surface active agents -- Washing powders -- Determination of apparent density -- Method by measuring the mass of a given volumestandard by International Organization for Standardization, 03/01/1981
ISO 4571:1981Manganese ores and concentrates -- Determination of potassium and sodium content -- Flame atomic emission spectrometric methodstandard by International Organization for Standardization, 03/01/1981
ISO 302:1981 [ Withdrawn ]Pulps; Determination of Kappa numberstandard by International Organization for Standardization, 02/01/1981
ISO 6127:1981Chromium ores -- Determination of phosphorus content -- Reduced molybdophosphate photometric methodstandard by International Organization for Standardization, 03/01/1981