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Regulations.gov (link is external) is an online resource for all regulations (or rulemakings) issued by U.S. government agencies.  On this site, the following can be found:

All Federal regulations that are open for public comment (i.e., proposed rules) and closed for comment (i.e., final rules) as published in the Federal Register (link is external).

Many Federal agency notices published in the Federal Register.

Additional supporting materials, public comments, and Federal agency guidance and adjudications.