Columbia subject headings:
Ecuador--Census, 1990.
Ecuador--Population--Statistics.
Guayaquil (Ecuador)--Population--Statistics.
Quito (Ecuador)--Population--Statistics.
Harvard subject headings:
Ecuador--Census, 1990.
Ecuador--Population--Statistics.
Guayaquil (Ecuador)--Population--Statistics.
Quito (Ecuador)--Population--Statistics.
Princeton subject headings:
Ecuador--Census, 1990.
Ecuador--Population--Statistics.
Guayaquil (Ecuador)--Population--Statistics.
Quito (Ecuador)--Population--Statistics.