doi:10.7916/7gax-yj35[Document, n.d. and 1780 March 2, February 19, February 29]Jay, John, 1745-1829correspondencetextUnited States--History--Revolution, 1775-1783Jay, John, 1745-1829Memoranda of codes used by John Jay. 3 Codes used with Silas Deane; and reference to suggested change in code included in John Jay to Deane, 2 October 1780. Code used with Robert R. Livingston Code used with Frederick Jay as explained in letter of 2 March 1780 (not found) Explanation of Cipher used with Robert R. Livingston, sent with John Jay to Livingston, 19 February 1780 (JPW 804; 7953). Explanation of code with Charles Thomson, extracted from John Jay to Thomson, 29 February 1780 (JPW: 90287) Explanation of code with Gouverneur Morris extracted from letter of 2 March 1780 (JPW: 8332 and 90288).