Die Familiennamen des ostfriesischen Kreises Leer, sprachliche und geographisch-statistische Untersuchungen zum Namenbestand um 1940. (Diss.) Groningen 1984. Geïll., 254 p.

Archives of the cotton mill ‘De Coster & Rousseau’ in Gent (Belgium), ca. 1850-1962. Large box with manuscripts, letters, financial documents, brochures, price lists, etc. concerning this firm, located at the Place des Chartreux 11 in Gent.