I'm no US lawyer but here's how I think it works.
US bankruptcy law is contained in title 11 of the United States Code.
Within title 11, the bankruptcy laws are divided into chapters (merely for easy reading, like the way books are divided into chapters 1, 2, 3.....).
It happens that the specific provisions relating to liquidation are in chapter 7 of title 11, corporate reorganisations in chapter 11, and provisions relating to individuals in chapter 13. Other chapters exist, but may relate to more general things.
The US code is here http://uscode.house.gov/download.htm
and if you click on title 11, you'll get the bankruptcy chapters.
Hope this helps!