素描
奥兰治家族与维特尔斯巴赫家族结合的寓言（论文标题页设计）`An Allegory of the Union of the House of Orange and the Wittelsbach Family (Design for a Title Page of a Thesis) (mid~17th–late 17th century) by Jonas Umbach
素描
十月（代表这几个月劳动的系列之一）`October (one of a series representing the labors of the months) (1690) by Jonas Umbach
素描
七月（代表这几个月劳动的系列之一）`July (one of a series representing the labors of the months) (1690) by Jonas Umbach
