the Netherlands grew by 297%. (*) Derived from those persons who stated "Judaism" as their religion in the Dutch Census (**) Persons with at least one Jewish grandparent. In another Nazi census the total number of people with at least one Jewish grandparent in the Netherlands was put at 160,886: 135,984 people with 4 or 3 Jewish grandparents (counted as "full Jews"); 18,912 Jews with 2 Jewish grandparents ("half Jews"), of whom 3,538 were part of a Jewish congregation; 5,990 with 1 Jewish grandparent ("quarter Jews") (***) Membership numbers of Dutch Jewish congregations (only those who are Jewish according to the Halakha) The Holocaust In 1939, there were some 140,000 Dutch Jews living in the Netherlands, among them some 24,000 to 25,000 German-Jewish refugees who had fled from Germany in the 1930s. (Other sources claim that some 34,000 Jewish refugees entered the Netherlands between 1933 and 1940, mostly from Germany and Austria). Some 75% of the Dutch-Jewish population was murdered in the Holocaust. The 1947 census reported 14,346 Jews, or 10% of the pre-war population. This further decrease is attributed to massive aliyah to Mandatory Palestine. 1945–1960 The Jewish-Dutch population after the Second World War is marked by certain significant changes: disappointment, emigration, a low birth rate, and a high intermarriage rate. After the Second World War and the Holocaust, returning Jews and Jews who had survived the often difficult hidden living ('diving') met with total lack of understanding of their fate and had to endure lasting loss of property. Especially mental health care was lacking and only started to develop from 1960 onwards in the Sinai centrum in Amersfoort. From 1973 professor Bastiaans tried to treat Holocaust victims with LSD in the Centrum '45 in Oegstgeest, attached to the Leyden University. This brought little success, if any. Understanding started to grow by a series of four TV documentaries on the Nazi occupation of the Netherlands made by the Jewish historian Lou de Jong, broadcast on Dutch national public TV (NTS, then the sole TV channel). The first four installments aired in 1960, were considered a turning point and left many Dutch, who until then had hardly had any notion of the gruesome depth of the Holocaust, aghast. The series continued through 1964. Dr De Jong subsequently published a 14-part, 29-volume history of the Netherlands during World War II. In 1965, the Jewish professor of history Jaques Presser published his