1To Thomas Jefferson from Tadeusz Kosciuszko, [on or before 23 March 1798] (Jefferson Papers)
...making arrangements so secret that even Julian Niemcewicz, who had accompanied the general to...
2To Thomas Jefferson from Tadeusz Kosciuszko, [before 5 May 1798] (Jefferson Papers)
...Gahn, who was a friend of Julian Niemcewicz and whose business interests took him as far south...
3To Thomas Jefferson from Tadeusz Kosciuszko, [15 July–5 August 1798] (Jefferson Papers)
: Julian Niemcewicz. Kosciuszko’s references to his possessions transferred to TJ’...
4To Thomas Jefferson from Tadeusz Kosciuszko, [15 July–5 August 1798] (Jefferson Papers)
...turn in money thos things that are delivered by Mr: Niemcewicz