- Contest program, 1 sheet, with 2 attachments (blueprints)
- Budget, 4 sheet hs.
- Calculations and construction sketches, 5 sheet hs.
- "Contest Water Tower motto 39500 Explanatory Notes," 2 p. ms.
- "Contest Water Tower motto 42500 Remarks," 2 p. ms.
- Statement of receipt, April 5, 1927
- "For i 10," notes, 1 p. hs.
- Clippings:
  C. van Eesteren, "On account of the competition for a water tower at Wassenaar", i 10 no. 8-9, 1927 p. 286-89
  Nieuwe Rotterdamse Courant, Sept. 10, 1927
- "A water tower a la Hendriks", pen drawing
- 5 photos of design drawings
- 1 photo of the situation