Old Codes
From time to time it is useful to review old codes. If you are ever so inclined here are a few you can access for free. https://www.apti.org/assets/Committees/technicalcommittees/CodesandStandards/2019/Legacy%20Building%20Codes%20Online.pdf
If you ever need something not on this list and you have a hard time finding it reach out to Glenn Mathewson on Linked In. he is a code historian and he might be able to help you. He is a super nice guy as well.