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Continue to ChatIS-2720 (PART 22)-1972 INDIAN STANDARD METHODS OF TEST FOR SOILS DETERMINATION OF ORGANIC MATTER.(FIRST REVISION) https://civilengineer.co.in/indian-standard-codes/is-2720-part-22-1972-indian-standard-methods-of-test-for-soils-determination-of-organic-matter-first-revision/