1To Benjamin Franklin from the Abbé Raimondo Niccoli with a Note by Franklin, 26 May 1777 (Franklin Papers)
AL : British Library L’abbé Niccoli prie Monsieur franklin de luy faire l’honneur de venir...
2To Benjamin Franklin from Niccoli, 7 July 1777 (Franklin Papers)
ALS : American Philosophical Society Enclosed I send you a letter of our good friend Ingenhousz...