Columbia subject headings:
Antisemitism--Europe--History--20th century--Sources.
Holocaust, Jewish (1939-1945)--Sources.
Jews--Correspondence.
Jews--Persecutions--Europe--History--20th century--Sources.
Postal service--Europe--History--20th century.
World War, 1939-1945--Postal service.
Harvard subject headings:
Antisemitism--Europe--History--Sources.
Holocaust, Jewish (1939-1945)--Sources
Jews on postage stamps.
Jews--Persecutions--Europe--History--20th century--Sources.
National socialism--History--Sources.
Postcards--Europe--History--20th century.
World War, 1939-1945--Concentration camps--Europe--Sources.
World War, 1939-1945--Postal service.
Princeton subject headings:
Antisemitism--Europe--History.
Postage stamps--Europe--History.
Postal service--Europe--History.
Postcards--Europe--History.
Postmarks--Europe--History.