
When a public law is published in slip law form, the Office of the Federal Register, National Archives and Records Administration, provides marginal editorial notes giving citations to laws mentioned in the text. The marginal notes also give the United States Code classifications enabling the reader to know where the law will appear in the Code. These notes appear in the Legislation Insight compiled legislative history and are searchable on the Home screen or by using Advanced Search.
To find the public law that enacted or amended a section of the US Code, on the Home screen, type the citation in quotes. For our example, we're going to use "21 USCS 349." Do not include subsections.

You can access both the text of the US Code and the History section using ProQuest Congressional. You can use the Search by Number tab to enter the Code section to read the History and Amendments section to determine which public law amended the subsection or language you are researching.

Here is the slip law - you can see the US Code citation in the margin.
