KERSTEN— Twee requesten van Joseph Kersten, Amsterdam 1 en 23-10-1807, aan Lodewijk Napoleon betr. de functie als intendant van Soestdijk of Utrecht. Manuscript, 3 pag.

Letter of patent for André Michel Massonnet from Paris for an invention regarding “certain improvements in alloys of metal and of other substances and also in the application of the same to various usefull purposes”.