The Federal Register (FR) is a chronological publication, analogous to US Statutes at Large.
It is published daily (except weekends and official federal holidays) by US Office of the Federal Register; first issue March 14, 1936.
(a) GPO Govinfo 1936 - to the present
(b) Federal Register 2.0 - Organized for the public, ability to comment, plain language summaries. From the National Records and Archives Administration.
Materials required (by statute) to be published in Federal Register:
1. Presidential documents – Proclamations, Executive Orders, etc.
2. Rules and Regulations
3. Proposed Rules – text, regulatory agendas, and hearings notices
4. Notices – Sunshine Act meetings, etc.
Finding Aids (e.g., Table of Contents, List of CFR Parts Affected) included in each FR issue.
Monthly index; each index issue cumulates earlier index issues of that year. December issue serves as final annual index.
The CFR is an official compilation of codified regulations.
It is arranged by subject, analogous to US Code. However, CFR Title numbers do not always match USC Title numbers. [e.g., 26 USC – Internal Revenue Code and 26 CFR – tax regulations; but 20 USC – Education and 34 CFR – education regulations.]
The first edition published in 1939 (for regulations in effect as of 6/1/38). Paperbound volumes published annually (since 1967). US Office of the Federal Register revises CFR on quarterly basis – January 1st – Titles 1-16; July 1st – Titles 28-41; April 1st – Titles 17-27 October 1st – Titles 42-50.
Division of CFR's Fifty Titles:
CFR sections are often inter-related. Even if one has a cite to a particular Section, one may want to review the rest of the Sections in that Part.
Each CFR Part has:
CFR Index and Finding Aids published annually. Not comprehensive, and usually refers to Parts, not Sections within Parts. Includes Parallel Table of Authorities and Rules.
The Federal Judicial Center makes several of its publications freely available online.