Columbia subject headings:
Harvard subject headings:
Germany--Relations--United States--Encyclopedias.
United States--Civilization--Encyclopedias.
United States--Encyclopedias.
United States--History--Encyclopedias.
United States--Relations--Germany--Encyclopedias.
Princeton subject headings:
Encyclopedias.
Germany--Relations--United States--Encyclopedias.
United States--Civilization--Encyclopedias.
United States--History--Encyclopedias.
United States--Relations--Germany--Encyclopedias.