Columbia subject headings:
Germany--Foreign relations--Ireland.
Ireland--Foreign relations--Germany.
Irish question.
World War, 1914-1918--Diplomatic history.
Harvard subject headings:
Germany--Foreign relations--Ireland.
Ireland--Foreign relations--Germany.
Irish question.
World War, 1914-1918--Diplomatic history
Princeton subject headings:
Germany--Foreign relations--Ireland.
Germany--Relations--Ireland.
Ireland--Foreign relations--Germany.
Ireland--Relations--Germany.