buste ; MME DUMAS NEE NADEJA DE KNORRING (1827-1895)
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Ministère de la culture et de la communication, Musées de France {{cite web | url=http://www.europeana.eu/resolve/record/03919/80D64F6DFE205CEE026B5466BA67B0C23FC4D259|title=buste ; MME DUMAS NEE NADEJA DE KNORRING (1827-1895)|accessdate=2013-05-23 |publisher=Europeana}}
<ref>{{cite web | url=http://www.europeana.eu/resolve/record/03919/80D64F6DFE205CEE026B5466BA67B0C23FC4D259|title=buste ; MME DUMAS NEE NADEJA DE KNORRING (1827-1895)|accessdate=2013-05-23 |publisher=Europeana}}</ref>