1To Benjamin Franklin from Michel-Guillaume St. John de Crèvecœur, 5 December 1781 (Franklin Papers)
...I woud fain hope, must place the Keystone to the Strong arch of our American...
2To John Jay from Benjamin Franklin, 14 February 1782 (Jay Papers)
Your Comparison of the Keystone of an Arch is very pretty, tending to make...
3From Benjamin Franklin to [John Jay], [after 14 February 1782] (Franklin Papers)
Your Comparison of the Keystone of an Arch
4September 1784 (Washington Papers)
Pennsylvania: A Guide to the Keystone State
5[Diary entry: 11 September 1784] (Washington Papers)
Pennsylvania: A Guide to the Keystone State
6Debates and Resolutions Related to the Regulation of Commerce by Congress, Including a Call for a Convention at … (Madison Papers)
...northern trip that Virginia could be the keystone to a whole plan of national commercial...
7To James Madison from Thomas Jefferson, 22 July 1789 (Madison Papers)
...Vaudreuil, Abbé Vermont confessor of the queen and keystone of all the intrigues, all fled out...
8From Thomas Jefferson to James Madison, 22 July 1789 (Jefferson Papers)
...Vaudreuil, Abbé Vermont confessor of the queen and keystone of all the intrigues, all fled out...
9Thomas Boylston Adams to Abigail Adams, 9 June 1799 (Adams Papers)
...against Scott were that he used a rejected keystone to build a step leading into the kitchen...
10To James Madison from William Irvine, 23 March 1801 (Madison Papers)
The Keystone in the Democratic Arch: Pennsylvania Politics, 1800–1816