Addition 1939 21 Numbered specification drawings (specification 744); floor plans, cross-sections, facades, hood plan, window frames, technical details, tower elevation and a small perspective drawing, signed by J.Th.J. Cuypers and marked Arch. Bureau Cuypers J.Th.J. Cuypers and P.J.J.M. Cuypers, dated 1939, scale 1 to 1, 1 to 20, 1 to 100.