Columbia subject headings:
France--Foreign relations--Germany.
France--Foreign relations--Spain.
Franco-Prussian War, 1870-1871--Causes--Sources.
Germany--Foreign relations--France.
Germany--Foreign relations--Spain.
Spain--Foreign relations--France.
Spain--Foreign relations--Germany.
Spain--History--Revolutionary period, 1868-1875--Sources.
Harvard subject headings:
Spain--History--Revolutionary period, 1868-1875.
Princeton subject headings: