Columbia subject headings:
Harvard subject headings:
Beus, Jacobus Gijsbertus de, 1909-1991.
Germany--History--1933-1945.
Oster, Hans.
Sas, Gijsbert J.
Treason--Germany.
World War, 1939-1945--Campaigns--Western Front.
World War, 1939-1945--Germany.
World War, 1939-1945--Personal narratives, Dutch.
Princeton subject headings:
Beus, Jacobus Gijsbertus de, 1909-1991.
Germany--History--1933-1945.
Oster, Hans.
Sas, Gijsbert J.
Treason--Germany.
World War, 1939-1945--Campaigns--Western Front.
World War, 1939-1945--Germany.
World War, 1939-1945--Personal narratives, Dutch.