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After a public law is passed, it is first printed in a pamphlet form known as a slip law. (Technically, Congress can pass either public or private laws, but the vast majority are public ones. Public laws are of general application; private laws benefit a particular person or group.) Public laws are assigned a number, the first part being the session of Congress, the second part indicating it was the nth law passed that session (e.g., Pub. L. 107-110).
The second printing of a law comes as one of the session laws printed in the Statutes at Large--the slip laws in bound volumes, in chronological order of passage from a session of Congress. A Statutes at Large citation (e.g., 115 Stat. 1425) includes the volume and page number on which a law can be found. Since the second number is a page number, this allows for the possibility of a pinpoint cite.
Please note, access to certain databases linked in this guide may be restricted to UT Law or the UT community; please see the library's Databases page that lays out access privileges.
U.S. Code Congressional and Administrative News (USCCAN) is a unique resource published by West, available on Westlaw. It offers two sets of volumes per Congress: one set is a reprint of the Statutes at Large and the other set is labeled "Legislative History," containing lists of citations, selected, abridged reports, and presidential signing statements.
Thus USCCAN has characteristics of both a compilation and a list of citations. However, because it reprints only highlights from a law's legislative history, it is not a comprehensive source as either a compilation or a list. Still, it can be quite convenient to use--you will find references to the relevant portion of USCCAN listed section by section in the USCA. And because it focuses on the highlights, it can be a good first source to check.
Westlaw's "Graphical Statutes" and "Legislative History" Features
In addition to compiled legislative histories, Westlaw offers two features that are integrated into the search results from the U.S.C.A. or Public Laws databases. (The Graphical Statutes feature is noteworthy in that it offers a visual timeline of the changes to a section of the Code.) Keep in mind, however, that it is still worthwhile to seek out a full compiled history or a list of citations for comparison. Also, the links to testimony provided are unofficial transcripts of hearings, not the final, official versions that are published later.