Leiden has a digital collection of over 1200 North Korean propaganda posters from the 1950's up to the early 2000's. After years of diligent work, the Leiden University Libraries have just made their North Korean Posters collection available to the public: https://digitalcollections.universiteitleiden.nl/view/collection/NKPosters
This digital database consists of scans of over 1,000 printed North Korean posters from the private collection of Willem van der Bijl. Assembled from the turn of the century over the course of a decade, the collection contains posters from the time of the Korean War (1950-53) right through to the 2010s. Attesting to the thriving poster culture of the Democratic People’s Republic of Korea (North Korea), this digital archive is a visual legacy of the DPRK’s ideological, political, economic, social and cultural history.