The posters in the Special Collections form part of different collections. They include more than 3,500 booksellers’ posters, for example, most of which come from the Bibliotheek van het Boekenvak (the Library of the Book Trade), which includes the collection of the Stichting Collectieve Propaganda van het Nederlandse Boek (CPNB, Collective Promotion for the Dutch Book). The collections include a small selection, comprising approximately one hundred items, of booksellers’ posters from the Stichting Bibliotheek van het Boekenvak. A collection of a very different nature is the Social Medicine Posters collection, which consists of around 160 informative posters in the area of public health. These were collected by several professors from the University of Amsterdam.