Columbia subject headings:
Harvard subject headings:
Mexicans--California.
Mexico--Emigration and immigration.
United States--Emigration and immigration.
Zacatecas (Mexico)--Economic conditions.
Zacatecas (Mexico)--Social conditions.
Princeton subject headings:
Mexicans--California.
Mexico--Emigration and immigration.
United States--Emigration and immigration.
Zacatecas (Mexico : State)--Economic conditions.
Zacatecas (Mexico : State)--Social conditions.