The archive has a structure of two files that can be separated into two parts, namely between material of a personal nature and material concerning building practice.The material concerning building practice is split into the period before the East Indies (c.1900-1915),Dutch East Indies(c.1915-1925),Laren N.H.(c.1925-70). There was no clear chronology and much material was and is undated. The classification made in this inventory is based on the material found.Because the chronology of works from the Laren period was lacking, and it covers a relatively large period, I have made a dichotomy in this as well.The works from the Laren period are split into c.1925-1945, and c.1946-70.