Monument Protection
	- Aagtekerke, Reformed Church
	- Alkmaar, St. Laurens church
	- Arnhem, Eusebius church
	- Bergen op Zoom, Reformed St. Geertrudiskerk
	- Bokhoven, R.C. Church
	- Breda, Great Church, 1970
	- Breda, Reformed Great Church
	- Brielle, Reformed Church
	- Delden, Reformed Church
	- Delft, New Church
	- Delft, Old Church
	- The Hague, Great Church
	- Dordrecht, Reformed Church
	- Geervliet, Reformed Church
	- Geldermalsen, Reformed Church
	- 's-Hertogenbosch, St. Jan.
	- Heusden, Reformed Church
	- Leiden, Reformed Pieterskerk
	- Maastricht, St. Martinus Church
	- Meerssen, Sacrament House
	- Middelburg, Reformed Church
	- Middelburg, Reformed Choir Church
	- Midwolde, Reformed Church
	- Noordwijk Binnen, Reformed Church
	- Nijmegen, Hervormde Stevenskerk
	- Oosthuizen, Reformed Church
	- Rhoon, Reformed Church
	- Roermond, R.C. Munsterkerk, 1965 1st survey
	- Rolduc, abbey church
	- Spanbroek, Reformed Church
	- Stedum, Reformed Church
	- St. Maartensdijk, Reformed Church
	- Utrecht, Dom Church
	- Utrecht, Reformed Church of St. John
	- Venlo, R.C. St. Martinus Church
	- Vianen, Reformed Church
	- Wijkel, Reformed Church
	- IJsselstein, Reformed Church
	- IJsselstein, Reformed Church
	- Zevenaar, R.C. Church
	- Collection of Materials, 1970