Reports of her sister's work in Rehoboth, 1926-1956; Observations of Pagan Customs, 1955; Correspondence, 1951-1965; Preparations for Short Speeches, Devotions, 1926-1956 1952-1958;[estate was handed over in April 1986 by nephew, Mr. Hefendehl (about Mr. Töpperwien), ; collection of photo albums, loose photographs and picture postcards in the Historical Picture Archive];

Contains among other things: Correspondence of Ernst II, Draft of an ordinance and memorandum concerning the R e i c h s k o l o n i a l a m t ; conditions of the German Schutztruppe in South West Africa (including the Herero Uprising, railway construction, port facilities, organisational issues) ; border issues (including correspondence with King Leopold II of Belgium) ; business distribution plans ; budget for 1906 ; newspaper clippings Darin: overview plan of the railway line Windhuk-Rehoboth ; caricature from the "Kladderadatsch" (with illustration of Ernst II).

Contains: Budget for the financial year 1906; overview plan of the Windhik-Rehoboth line, 1905