IISH takes care of many international collections related to the global history of labour, workers, and labour relations. It has extensive collections about communism and socialism; several handwritten documents by Karl Marx in IISH's collection are listed on UNESCO's Memory of the World documentary heritage list. Sandra advised the three organisations on how they can interact with Wikimedia projects. She gave a two-day Wikimedia course to staff on location, where a great interest in further work with Wikimedia projects was expressed. During one of the workshops, a staff member of IISH uploaded a freshly digitised PDF of Marx' Das Kapital to Wikimedia Commons; an exemplar annotated by hand by Marx himself.
[Heraldry, image donations] Nassau-Vianden armorial and Kattendijke chronicle
The national library of the Netherlands (KB) donated two medieval masterpieces from its collections to Wikimedia Commons: