Columbia subject headings:
Aerial reconnaissance--History--20th century.
Photographic interpretation (Military science)--History--20th century.
World War, 1939-1945--Photography.
World War, 1939-1945--Reconnaissance operations.
Harvard subject headings:
Aerial reconnaissance--History--20th century.
Photographic interpretation (Military science)--History--20th century.
World War, 1939-1945--Photography.
World War, 1939-1945--Reconnaissance operations.
Princeton subject headings:
Aerial reconnaissance--History--20th century.
Photographic interpretation (Military science)--History--20th century.
World War, 1939-1945--Photography.
World War, 1939-1945--Reconnaissance operations.