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., ___.