1Frederick C. Schaeffer to Thomas Jefferson, 30 December 1819 (Jefferson Papers)
New York (city); Society for the Prevention of Pauperism [index entry]
2Thomas Jefferson to Frederick C. Schaeffer, 7 January 1820 (Jefferson Papers)
New York (city); Society for the Prevention of Pauperism [index entry]
3Frederick C. Schaeffer to Thomas Jefferson, 19 November 1821 (Jefferson Papers)
New York (city); Society for the Prevention of Pauperism [index entry]