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Free Legal Resources : Federal Constitution

U.S. Constitution

The Library of Congress provides materials related to the passage of the U.S. Constitution, including this copy belonging to George Washington with his handwritten comments.

U.S. Constitution

Constitution Annotated
The Library of Congress regularly prepares an annotated version of the U.S. Constitution, which analyzes each section of the Constitution and cites to relevant cases, statutes, and secondary sources.
Primary Documents in American History: United States Constitution
Library of Congress's collection of primary documents related to the drafting and adoption of the Constitution.
Constitution Annotated (CLII)
The Constitution Annotated, provided by the Cornell Legal Information Institute.