Joint Resolution proposing an amendment to the Constitution of the United States extending the right to vote to citizens eighteen years of age or older. Congress S.J. RES. 7.
Source:
National Archives, http://www.archives.gov/global-pages/larger-image.html?i=/historical-docs/doc-content/images/26th-amendment-18-vote-l.jpg&c=/historical-docs/doc-content/images/26th-amendment-18-vote.caption.html