This collection primarily documents the professional life of the social worker Gertrude van Tijn, who worked with Jewish refugees in Amsterdam during the 1930s-1940s. Much of the material focuses on the experiences of Dutch Jewry along with the German-Jewish refugees who had fled to Holland. About half the collection relates to the manual training farm Werkdorp Nieuwesluis. Some reports on the postwar refugee situation in Shanghai and Australia and biographical material are also present. The collection includes reports, correspondence, official documents, newspaper clippings and articles and a few photographs.