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Continue to ChatIS 9456 -1980 INDIAN STANDARD CODE OF PRACTICE FOR DESIGN AND CONSTRUCTION OF CONICAL AND HYPERBOLIC PARABOLOIDAL TYPES OF SHELL FOUNDATIONS https://civilengineer.co.in/indian-standard-codes/is-9456-1980-indian-standard-code-of-practice-for-design-and-construction-of-conical-and-hyperbolic-paraboloidal-types-of-shell-foundations/