The Fourth Circuit covers Maryland, North Carolina, South Carolina, Virginia, and West Virginia.
The Court's web site posts contact information, court rules, forms, etc. For questions, call the Court at 804-916-2700.
The Court posts opinions back to January 1, 1996, and Google Scholar goes back to the 1920's. FindLaw goes back to January 1995. You can search opinions for free on FindLaw back to January 1995. For deeper databases, search the fee-based services such as Lexis and Westlaw.
For other Circuit Court entries, search "United States Court of Appeals" as a Subject.