Federal agency rulemaking is governed by the Administrative Procedure Act. The most commonly-used type of process is informal rulemaking, which generally requires the agency to provide notice of the proposed rule and a "meaningful opportunity" for the public to comment on the rule.
The Federal Register (Fed. Reg.) is the official daily publication for rules, proposed rules, and notices of federal agencies and organizations, as well as executive orders and other presidential documents.
The Code of Federal Regulations (C.F.R.) is the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the federal government. It is divided into 50 titles that represent broad areas subject to federal regulation. The 50 subject matter titles contain one or more individual volumes, which are updated once each calendar year, on a staggered basis.