Columbia subject headings:
Ecuador--Economic conditions.
Encomiendas (Latin America)
Land tenure--Ecuador--History.
Mines and mineral resources--Ecuador--History.
Harvard subject headings:
Ecuador--Economic conditions.
Encomiendas (Latin America)
Land tenure--Ecuador--History.
Mines and mineral resources--Ecuador--History.
Princeton subject headings:
Ecuador--Economic conditions.
Encomiendas (Latin America)
Land tenure--Ecuador--History.
Mines and mineral resources--Ecuador--History.