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The companion handbook SP 16: Design Aids for Reinforced Concrete to IS 456:1978 remains widely available for those studying the older design methods.
The code is the third revision of the Indian Standard Code of Practice for Plain and Reinforced Concrete, which was primarily based on the Working Stress Method . While it remains a fundamental document for academic reference and historical study, it has been superseded by IS 456:2000 , the fourth and current revision. Key Status and Availability is 456 code 1978 free download pdf new