The Dutch government established a camp at Westerbork to intern Jewish refugees who had entered the Netherlands illegally. This sketch of the Westerbork transit camp was made by a Jewish inmate who was able to emigrate to the United States. In early 1942, the German occupation authorities decided to enlarge Westerbork and convert it into a transit camp for Jews. The systematic concentration of Jews from the Netherlands in Westerbork began in July 1942. From Westerbork, Jews were deported to the killing centers in German-occupied Poland.