Columbia subject headings:
Central America--Economic conditions.
Central America--Social conditions.
Mercado Común Centroamericano.
Taxation--Central America--Social conditions.
Harvard subject headings:
Central America--Economic conditions.
Mercado Común Centroamericano.
Taxation--Central America.
Princeton subject headings:
Central America--Economic conditions.
Mercado Común Centroamericano.
Taxation--Central America.