The ABA Supreme Court Preview website provides briefs on the merits going back to the Court's 2003 term. Amicus briefs are included, but only for cases from the current term. The main Preview page provides links to lists of cases argued in each term (listed alphabetically by case name). The alphabetical list shown below is for the 2011-2012 term.
To view briefs from past terms, scroll down to the middle of the Preview home page. On the right side of the screen you will see the heading “Briefs from Past Terms."
