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IS: 2720-1977, . (1977). METHODS OF TEST FOR SOILS - PART- XL DETERMINATION OF FREE SWELL INDEX OF SOILS. DELHI: ISI.
IS: 2720-1977, . 1977. METHODS OF TEST FOR SOILS - PART- XL DETERMINATION OF FREE SWELL INDEX OF SOILS. DELHI: ISI.
IS: 2720-1977, . METHODS OF TEST FOR SOILS - PART- XL DETERMINATION OF FREE SWELL INDEX OF SOILS. DELHI: ISI. 1977.