Columbia subject headings:
Harvard subject headings:
Blocker, Billy B. 1921-
Prisoners of war--Germany
Prisoners of war--United States
World War, 1939-1945--Aerial operations, American.
World War, 1939-1945--Personal narratives, American.
World War, 1939-1945--Prisoners and prisons, German.
Princeton subject headings:
Blocker, Billy B., 1921-
Bomber pilots--United States--Biography.
World War, 1939-1945--Aerial operations, American.
World War, 1939-1945--Personal narratives, American.
World War, 1939-1945--Prisoners and prisons, German.