 The collection is in 24 volumes and includes work from important Dutch mapmakers, such as Blaeu, Abraham Ortelius, Visscher, Schenk, Frederik de Wit and Hondius.Parts of the collection have been digitised.The volume, "Country houses and gardens of the Netherlands – part one" (Shelfmark C.9.e.7) has been made available in the Turning the Pages online exhibition and Volume 21 has been made available at the Memory of the Netherlands, a joint project with Koninklijke Bibliotheek, the National Library of the Netherlands.