The archive has been edited several times in the past. A fiche system with descriptions of individual drawings, (most likely made in the 1970s, at least after 1974),has been updated by arranging the whole thing project by project according to the order of this preliminary inventory. (Numbers refer to inventory numbers). When comparing the above-mentioned fiche system with the provisional inventory, it is apparent that quite a few drawings have disappeared over the years. Another processing produced, among other things, a list of descriptions of photographs; this is included in an appendix (see page 8).The arrangement of this tabular inventory is chronological. Some drawings by the hand of the architect A .L. van Gendt bear the dates 1879 and 1892 (see inv. no. 50). These dates are not included in the title.