Family tree Helmantel » Sources » "Amsterdamsch Jaarboekje" 1899; Miscellanea, Volume 1969 van I. Quirijn Regteren Altena; Voor Nederland bewaard: de verzamelingen van het Koninklijk Oudheidkundig Genootschap in het Rijksmuseum van de Prom, 1995; The History of Decorative Arts: Classicism and the Baroque in Europe van Alain Charles Gruber
Source description
"Amsterdamsch Jaarboekje" 1899; Miscellanea, Volume 1969 van I. Quirijn Regteren Altena; Voor Nederland bewaard: de verzamelingen van het Koninklijk Oudheidkundig Genootschap in het Rijksmuseum van de Prom, 1995; The History of Decorative Arts: Classicism and the Baroque in Europe van Alain Charles Gruber
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