The UGA Libraries has several databases which index government documents. These databases often contain historical documents unavailable on free internet websites:
ProQuest Congressional: Contains hearings, prints, reports, bills, Congressional Record, CRS Reports, Federal Register, Code of Federal Regulations.
ProQuest Supreme Court: Contains briefs, dockets, joint appendixes, oral arguments, opinions and other documents for U.S. Supreme Court cases from 1975-present.
ProQuest Regulatory Insight: Contains U.S. federal administrative law histories for the period 1936-2015 organized by federal statute and Executive Order.
Legislative Insight: Contains legislative histories for enacted legislation from the US Congress, including reports, hearings, and signing statements.