Columbia subject headings:
Missing in action.
Prisoners of war--Soviet Union.
Prisoners of war--United States.
Soviet Union--Missing in action.
Soviet Union--Prisoners and prisons, American.
Vietnam War, 1961-1975--Missing in action.
Vietnam War, 1961-1975--Prisoners and prisons, American.
Harvard subject headings:
Prisoners of war--Soviet Union.
Prisoners of war--United States
Vietnam War, 1961-1975--Missing in action
Vietnam War, 1961-1975--Prisoners and prisons, American
Princeton subject headings:
Prisoners of war--Soviet Union.
Prisoners of war--United States.
Vietnam War, 1961-1975--Missing in action.
Vietnam War, 1961-1975--Prisoners and prisons, American.