1. General State Archives (Algemeen Rijksarchief; ARA), recently renamed Nationaal Archief (National Archives; NA), The Hague Archives of the Provincial Executive of South-Holland (Provinciaal Bestuur Zuid-Holland), subsidies and minutes of the Provincial Executive (Gedepu-teerde Staten), 1898 Archives of J. T. Cremer
2. Municipal Archives (Gemeente-archieven; GA), Amsterdam, Den Bosch, Groningen, Kampen, Leeuwarden, Leiden, Nijmegen, Nunspeet, and Oldenzaal Records Office data
3. The Hague Municipal Archives Records Office data Municipal Government archives,1897–1899(correspondence received from the NTV Board, permits from the Labor Inspectorate, Fire Department, and Building Inspectorate) Municipal Council proceedings, 1897–1899
4. Enschede Municipal ArchivesRecords Office data Tattersall & Holdsworth archives, 1876–1916
5. The Hague Municipal Museum (Haags Gemeentemuseum; HGM)Musical archives, composer Alphons Diepenbrock collection