J. Elliott Drinard, “James Mercer, 1736-1793,” Proceedings of the Thirty-Ninth Annual Meeting of the Virginia State Bar Association (August 1928), 423-435.
John Melville Jennings and James Mercer, “Letters of James Mercer to John Francis Mercer,” The Virginia Magazine of History and Biography, Vol. 59, No. 1 (Jan. 1951); and Vol. 59, No. 2 (April 1951); 13 letters, January-September 1783.
James Mercer’s letters to his half-brother, John Francis Mercer, while John Mercer was attending the Continental Congress in 1782.
Founders Online, from the National Archives and Records Administration, provides access to Mercer’s correspondence, 1771-1793, in the Papers of George Washington and the Papers of Thomas Jefferson; most concern Washington’s efforts to collect money owed to him by Mercer. Of note are a Petition to Governor and Council (November 1, 1771) concerning distribution of bounties for service in the French and Indian War; a Notice Concerning Legal Fees (May 20, 1773) a complaint from Mercer and five other attorneys practicing in the General Court; and a letter to Governor Thomas Jefferson pleading for protection of the gunworks in Fredericksburg.
University of Virginia (Albert and Shirley Small Special Collections Library)
Legal notes of Charles Lee, 1783-1793,1855; 1 volume (microfilm; originals privately owned).
Notes regarding opinions of Mercer and other judges of the General Court and the Virginia Court of Appeals.