Jean-Jacques Dessalines to George Nugent and John Thomas Duckworth, 2 September 1803, MS 72, National Library of Jamaica.

Also two copies available at The National Archives of the UK:

Jean-Jacques Dessalines to George Nugent and John Thomas Duckworth, 2 September 1803, CO 137/110, The National Archives of the United Kingdom.

AND

Jean-Jacques Dessalines to George Nugent and John Thomas Duckworth, 2 September 1803, ADM 1/253, The National Archives of the United Kingdom.