Columbia subject headings:
Hagen (Arnsberg, Germany)--Biography.
Petersen, Bernhard, 1899-1972--Diaries.
World War, 1939-1945--Germany--Hagen (Arnsberg)
World War, 1939-1945--Personal narratives, German.
Harvard subject headings:
Hagen (Arnsberg, Germany)--Biography.
Petersen, Bernhard, 1899-1972--Diaries.
World War, 1939-1945--Germany--Hagen (Arnsberg)
World War, 1939-1945--Personal narratives, German.
Princeton subject headings:
Hagen (Arnsberg, Germany)--Biography.
Petersen, Bernhard, 1899-1972--Diaries.
World War, 1939-1945--Aerial operations, American.
World War, 1939-1945--Aerial operations, British.
World War, 1939-1945--Germany--Hagen (Arnsberg).
World War, 1939-1945--Personal narratives, German.