Code of Federal Regulations The complete Code of Federal Regulations (CFR) is divided into 50 titles. Some titles have more than one volume. The 50 titles together contain the regulations of all the various Federal agencies. Each title of the CFR is divided into chapters, subchapters, parts, subparts (in some parts), sections, and paragraphs. Each part begins with a table of contents that lists each section of the part. The legal authority for the part follows the table of contents. The first section of each part is usually a list of definitions for that part.
Parts 300-399 of title 7 of the CFR contain APHIS regulations related to plants; parts 1-199 of title 9 of the CFR contain APHIS regulations related to animals.
The CFR is revised annually, at different times of the year for different titles. The CFR volumes that contain APHIS's regulations are updated every year as of January 1, to show all changes that became effective during the previous calendar year.