The archive consists of drawings, photographs, clippings and specifications. The archive is packed in archival and roller boxes. The large drawings are packed in roller boxes (t1-t31). In the archive boxes are the files containing clippings, blueprints, photographs, etc..Attached is an old works list concerning the period 1927-1936 ("Dutch period"), with a reference to the drawing and/or file number by which the records can be requested.
In September 1992, the latest acquisition for the archive was processed. This is an addition to file no. 19, competition design house Dr. Dippel. Leppla won first prize with this. The acquisition consists of the following documents: "specifications and conditions", illuminated print and correspondence between Dr. Dippel and H. Leppla and H. Leppla and persons involved in the construction.
A number of records are in poor condition, these are not currently consultable. From the archives has not been destroyed.