Columbia subject headings:
Customs administration--Law and legislation--Central America.
Customs administration--Law and legislation--Costa Rica.
Tariff--Law and legislation--Central America.
Tariff--Law and legislation--Costa Rica.
Harvard subject headings:
Customs administration--Law and legislation--Central America.
Customs administration--Law and legislation--Costa Rica.
Tariff--Law and legislation--Central America.
Tariff--Law and legislation--Costa Rica.
Princeton subject headings: