The U.S. Supreme Court's online merits briefs collection includes a brief dated as early as August 12, 1936.
Sources
- Where to Find Briefs of the Supreme Court of the U.S. (supremecourt.gov)
- https://guides.tricolib.brynmawr.edu/c.php?g=285494&p=1904404 (guides.tricolib.brynmawr.edu)
- https://libguides.law.umn.edu/caserecords/ussct (libguides.law.umn.edu)
- https://guides.law.stanford.edu/c.php?g=676062&p=4764062 (guides.law.stanford.edu)
- https://guides.brooklaw.edu/Supreme_Court/briefs (guides.brooklaw.edu)
- https://lls.libanswers.com/library-faqs/faq/420444 (lls.libanswers.com)