I believe that the largest group of related ISO standards in terms of number of pages is ISO 10303 [1], I suspect that they could have achieved wider adoption i

I believe that the largest group of related ISO standards in terms of number of pages is ISO 10303 [1], I suspect that they could have achieved wider adoption if they were not paywalled. [1] https://en.wikipedia.org/wiki/ISO_10303 https://en.wikipedia.org/wiki/ISO_10303