“To George Washington from John Armstrong, 24 January 1770 [letter not found],” Founders Online, National Archives, https://founders.archives.gov/documents/Washington/02-08-02-0201. [Original source: The Papers of George Washington, Colonial Series, vol. 8, 24 June 1767 – 25 December 1771, ed. W. W. Abbot and Dorothy Twohig. Charlottesville: University Press of Virginia, 1993, p. 299.]