Columbia subject headings:
Harvard subject headings:
Destroyer escorts--Atlantic Ocean--History--20th century.
Destroyer escorts--Germany--History--20th century.
Germany. Kriegsmarine--Officers--Biography.
Submarine captains--Germany--Biography.
Walther, Rudolf, 1922-
World War, 1939-1945--Naval operations, German.
World War, 1939-1945--Naval operations--Submarine.
World War, 1939-1945--Personal narratives, German.
Princeton subject headings:
Destroyer escorts--Atlantic Ocean--History--20th century.
Destroyer escorts--Germany--History--20th century.
Germany. Kriegsmarine--Officers--Biography.
Submarine captains--Germany--Biography.
Walther, Rudolf, 1922-
World War, 1939-1945--Naval operations, German.
World War, 1939-1945--Naval operations--Submarine.
World War, 1939-1945--Personal narratives, German.