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Title 1

Displaying title 1, up to date as of 8/07/2026. Title 1 was last amended 12/29/2022.
eCFR Content

The Code of Federal Regulations (CFR) is the official legal print publication containing the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. It is not an official legal edition of the CFR.

Learn more about the eCFR, its status, and the editorial process.

References

§ 21.21 General requirements: References.

(a) Each reference to the Code of Federal Regulations shall be in terms of the specific titles, chapters, parts, sections, and paragraphs involved. Ambiguous references such as “herein”, “above”, “below”, and similar expressions may not be used.

(b) Each document that contains a reference to material published in the Code shall include the Code citation as a part of the reference.

(c) Each agency shall publish its own regulations in full text. Cross-references to the regulations of another agency may not be used as a substitute for publication in full text, unless the Office of the Federal Register finds that the regulation meets any of the following exceptions:

(1) The reference is required by court order, statute, Executive order or reorganization plan.

(2) The reference is to regulations promulgated by an agency with the exclusive legal authority to regulate in a subject matter area, but the referencing agency needs to apply those regulations in its own programs.

(3) The reference is informational or improves clarity rather than being regulatory.

(4) The reference is to test methods or consensus standards produced by a Federal agency that have replaced or preempted private or voluntary test methods or consensus standards in a subject matter area.

(5) The reference is to the Department level from a subagency.

[37 FR 23611, Nov. 4, 1972, as amended at 50 FR 12468, Mar. 28, 1985]

§ 21.23 Parallel citations of Code and Federal Register.

For parallel reference, the Code of Federal Regulations and the Federal Register may be cited in the following forms, as appropriate:

___ CFR ___ (___ FR ___). § ___ of this chapter (___ FR ___).

§ 21.24 References to 1938 edition of Code.

When reference is made to material codified in the 1938 edition of the Code of Federal Regulations, or a supplement thereto, the following forms may be used, as appropriate:

___ CFR, 1938 Ed., ___.

___ CFR, 1943, Cum. Supp., ___.

___ CFR, 1946 Supp., ___.