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This is the most reliable source for public domain or older technical documents. You can search for "IS 456 1978 pdf" on the Internet Archive. It often hosts scans of the original bureau documents.

and is now primarily used for historical or academic purposes, as it is no longer the valid standard for modern construction. Document Details and Availability Official Status : Superseded. The current valid version is IS 456:2000 , which was reaffirmed in 2021. Free Downloads is 456 code 1978 free download pdf new