Specifically I'm looking for NSF/ANSI 51-2019 though an older one would probably be fine since I don't think they've changed anything relevant to what I'm trying to figure out.
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idk but I found this pdf from 1997 https://standards.nsf.org/apps/group_public/download.php/3941/nsf51-97.pdf
thanks for digging this up, I guess I thought even 20 years ago it was way more detailed. also I guess it's not really that important to the thing I'm trying to figure out anyways.