 The collection is based on Joan Blaeu's maps of towns of the Netherlands, "Tooneel der Steden van de Vereenighde Nederlanden" and the part of Blaeu's "Atlas Major" covering the Netherlands.Beudeker also collected many maps, portraits, drawings, views, and satirical prints dated between 1600 and 1756.Additional material added after Beudeker's death extended the collection up to 1815.