Presidential Proclamations (NAID 299955)
series in the National Archives and Records Administration's holdings
National Archives at Washington, DC - Textual Reference
National Archives and Records Administration
General Records of the United States Government (NAID 340)
US National Archives series: Presidential Proclamations, 1791 - 2016
George Washington's October 3, 1789, Thanksgiving Day Proclamation. (NAID 299956)