Columbia subject headings:
Political parties--Caribbean Area--Encyclopedias.
Political parties--North America--Encyclopedias.
Political parties--South America--Encyclopedias.
Harvard subject headings:
Political parties--America.
Political parties--Caribbean Area.
Political parties--Central America.
Political parties--North America.
Political parties--South America.
Political parties--Western Hemisphere.
Princeton subject headings:
Political parties--America.
Political parties--Caribbean Area.