Columbia subject headings:
Harvard subject headings:
Germany--Foreign relations--United States.
Poland--Politics and government--1989-
United States--Foreign relations--Germany.
Princeton subject headings:
Germany--Foreign relations--United States--20th century.
Germany--Foreign relations--United States--21st century.
Poland--Politics and government--1989-
United States--Foreign relations--Germany--20th century.
United States--Foreign relations--Germany--21st century.