Columbia subject headings:
Labor supply--Mexico.
Mexico--Emigration and immigration.
Migration, Internal--Mexico.
United States--Emigration and immigration.
Wages--Mexico.
Harvard subject headings:
Labor supply--Mexico.
Mexico--Emigration and immigration.
Migration, Internal--Mexico
United States--Emigration and immigration.
Wages--Mexico.
Princeton subject headings:
Labor supply--Mexico.
Mexico--Emigration and immigration.
Migration, Internal--Mexico.
United States--Emigration and immigration.
Wages--Mexico.