Twenty-five collections comprise the Seeley G. Mudd Manuscript Library's holdings in American jurisprudence. These collections document important issues spanning the 20th century, especially civil liberties and civil rights, but also the history of the Supreme Court. Significant collections include the papers of Justice John Marshall Harlan, Judge Harold R. Medina, Edward S. Corwin, Alpheus T. Mason, the ACLU Records, and a lengthy transcript of an oral history interview with Justice William O. Douglas.