To view a list of the 195 pieces in the collection, go to
http://catalogue.bnf.fr/jsp/recherchemots_simple.jsp?nouvelleRecherche=O&nouveaute=O&host=catalogue
In Recherche input 'De Ridder' and click 'Enter' on your computer.
'Click' on the blue Documents iconographiques to the right,
Presently, only about a half of these are viewable.