4 Drawings , 1957 and s.y.; 1 floor plan and drawing of walls of a room, 1960 (citing file number 199); 8 interior drawings i.s.m. T. Bodon Kuipers, 1960; 8 drawings by Pander Meubelfabriek Leidschedam, 1960; 1 specification drawing, 1962 (citing file number 491); 16 numbered specification drawings, 1964; 5 numbered drawings by Bouwbureau Congresgebouw, 1964; 1 drawing showing a proposal for a change to the flag center, 1980.