Nederlands Muziek Instituut
The Netherlands Music Institute (NMI) in The Hague (now part of the Haags Gemeentarchief) is the center for the musical heritage of the Netherlands.
The music scores and other archival documents of Willem Breuker are among the collections of the NMI.
Address: Haags Gemeentearchief, Spui 70, 2511 BT The Hague.
Acces archives only by appointment.