Columbia subject headings:
Harvard subject headings:
Fecundidad humana--Frontera Norte, México.
Fertility, Human--Mexico--Statistics.
Frontera Norte, México--Emigración e inmigración.
Mexico, North--Economic conditions.
Mexico, North--Population.
Migration, Internal--Mexico
Princeton subject headings:
Fertility, Human--Mexico--Statistics.
Mexico, North--Economic conditions.
Mexico, North--Population.
Migration, Internal--Mexico.