Columbia subject headings:
Franco, Francisco, 1892-1975.
Hitler, Adolf, 1889-1945.
Spain--History--Civil War, 1936-1939--Participation, German.
Harvard subject headings:
Franco, Francisco, 1892-1975
Germany--Foreign relations--1933-1945.
Germany--Foreign relations--Spain.
Hitler, Adolf, 1889-1945
Spain--Foreign relations--1931-1939.
Spain--Foreign relations--Germany.
Spain--History--Civil War, 1936-1939.
Princeton subject headings:
Franco, Francisco, 1892-1975.
Germany--Foreign relations--Spain--20th century.
Hitler, Adolf, 1889-1945.
Spain--Foreign relations--Germany--20th century.
Spain--History--Civil War, 1936-1939--Causes.