Jean-Jacques Dessalines to the inhabitants of the Spanish part of the island, 8 May 1804, MS 72, National Library of Jamaica.

Also two copies at The National Archives of the UK:

Jean-Jacques Dessalines to the inhabitants of the Spanish part of the island, CO 137/111, The National Archives of the United Kingdom.

AND

Jean-Jacques Dessalines to the inhabitants of the Spanish part of the island, CO 137/113, The National Archives of the United Kingdom.

The Proclamation was also published in translation in American newspapers. For example:

Jean-Jacques Dessalines, Governor-General, to the Inhabitants of the Spanish Part, 8 May 1804, New-York Commercial Advertiser, 4 June 1804, Page 3.