To George Washington from Richard Washington, 9 September 1757 [letter not found]
Letter not found: from Richard Washington, 9 Sept. 1757. On 18 March 1758 GW wrote to Richard Washington: “I have receivd your favour of the 9th of Septr preceeding.”
“To George Washington from Richard Washington, 9 September 1757 [letter not found],” Founders Online, National Archives, https://founders.archives.gov/documents/Washington/02-04-02-0255. [Original source: The Papers of George Washington, Colonial Series, vol. 4, 9 November 1756 – 24 October 1757, ed. W. W. Abbot. Charlottesville: University Press of Virginia, 1984, p. 400.]