Wow, an hour from Q to A. Go pprune!
https://dotlibrary.specialcollection.net/Contents with a free login looks to be the best free option.
https://home.heinonline.org/titles/C...eral-Register/ looks to be the best paid option back to 1938 and
https://www.gpo.gov/fdsys/ now
https://www.govinfo.gov for post 1997 free. Still haven't been able to find were 33 √(W/S) changed from 38 √(W/S) though... digging..