Legislative Research: A Web-Based Bibliographic Instruction Program
This will give you an overview of the research process for federal legislative documents. It is maintained by the Documents Center at the University of Michigan.
Library of Congress explanation of Federal Statutes
Definitions of Common Versions of Bills
Glossary of Legislative Terms (from congress.gov)
Proquest Congressional
Library subscription database includes comprehensive index to CRS Reports, bills, hearings, reports, committee prints, public laws, etc. Many items in full text.
Congress.gov supersedes the THOMAS system which was retired on July 5, 2016.
The scope of data collections and system functionality have continued to expand since THOMAS was launched in January 1995, when the 104th Congress convened. THOMAS was produced after Congressional leadership directed the Library of Congress to make federal legislative information freely available to the public.
For more information, see SU Library's US Government Information page, especially their Judicial Branch page.