The Code of Federal Regulations (CFR) is an annual compilation of final agency regulations organized by the 50 titles of the United States Code. The CFR is updated once each calendar year and issued quarterly. In order to obtain the most current regulations on a given topic, first consult the most current CFR, then search the Federal Register for any changes adopted since the most current CFR was published.
The CFR is available from these electronic sources:
Lexis Advance Contains full-text from 1981. Updated biweekly.
Westlaw Code of Federal Regulations is for regulations currently in effect. Code of Federal Regulations - Historical coverage starts at 1984.
FDSys Browse, keyword search, or retrieve CFR part or section by citation from 1997 forward (select titles from 1996). The online version is updated once per calendar year on a quarterly basis.
HeinOnline Contains full-text from inception (1938 to present). Retrieve by FR or CFR citation, browse, or search full text for words or phrase.
e-CFR An unofficial version of the CFR, updated daily. Browse by title or search terms within segments. Advanced searching allows Boolean and proximity searching.