1Caesar A. Rodney to Thomas Jefferson, 8 August 1818 (Jefferson Papers)
Cobbett, William; as “Peter Porcupine,” [index entry]
2Benjamin Waterhouse to Thomas Jefferson, 26 March 1813 (Jefferson Papers)
Cobbett, William; as “Peter Porcupine,” [index entry]
3Benjamin Rush to Thomas Jefferson, 17 December 1811 (Jefferson Papers)
Cobbett, William; as “Peter Porcupine,” [index entry]