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MLIC Floor Guide to Materials: Code of Federal Regulations

This guide describes basic use of specific sets of books in the MLIC, and is best used in conjunction with a mobile phone and the QR Codes you will find near the sets. If you are accessing this guide via the MLIC's app, just select a floor and book set.

Code of Federal Regulations

Once a final federal regulation is published in the Federal Register, it is then codified in the Code of Federal Regulations. C.F.R. is the abbreviation. The C.F.R. is organized by "Title" -- there are 50 of these. Each title represents a broad area that is subject to regulation; for example, Title 37 is Patents, Trademarks, and Copyrights. Each title further breaks down into chapters, whose names usually correspond to the regulation-issuing agency. For example, Chapter 1 of Title 37 is the US Patent and Trademark Office, and Chapter 2 is entitled Copyright Office. Each chapter of the C.F.R. further breaks down into parts and sections.


Updating CFR regulations

Start with your CFR citation in the E-CFR.

Note the currency of the information.  Currency will be noted as E-CFR data is current as of [date].  All final regulations as of the currency date are included.  Any regulations finalized after that date must be located in the Federal Register issues after that date.

Scan the Federal Register issues after the currency date of the E-CFR to find final regulations


Use the List of CFR Parts Affected from the Federal Register select the dates you wish to browse by using the pull-down menu. Click GO and then scan the listed CFR titles and parts for those you are interested in.  This will provide you with any final regulations that appear in Federal Register issues since the currency date of the E-CFR.


If you are interested in proposed changes to a CFR title and section as well as final regulations that affect that CFR title and section, use the List of CFR Sections Affected publication.

The List of CFR Sections Affected (LSA) lists proposed, new, and amended Federal regulations that have been published in the Federal Register since the most recent revision date of a Code of Federal Regulations (CFR) title.

To use the LSA, first note the CFR title that contains the regulation you are interested in.

Next, check the most recent revision date for the title. 

Titles 1-16 are revised as of January 1

Titles 17-27 are revised as of April 1

Titles 28-41 are revised as of July 1

Titles 42-50 are revised as of October 1

Check the latest monthly issue since the revision date of the CFR title by opening up the Monthly LSA issues and choosing the latest montly issue from those listed. Issues of the LSA are cumulative so you only need to look in the most current monthly issue for changes.  Dates of coverage for changes will noted at top of LSA pages.

Choose the CFR title you are interested in (open up the PDF version)and scan the listed sections to see if the section you are interested in has any reported changes.  If the section has any changes, you will see the Federal Register page referenced where you will find the change reported.

Access the Federal Register pages by accessing the FDsys retrieve by citation search.