Columbia subject headings:
Harvard subject headings:
Mexico--Emigration and immigration--Case studies.
Migration, Internal--Mexico--Case studies.
Rural-urban migration--Mexico--Case studies.
United States--Emigration and immigration--Case studies.
Princeton subject headings:
Mexico--Emigration and immigration--Case studies.
Migration, Internal--Mexico--Case studies.
Rural-urban migration--Mexico--Case studies.
United States--Emigration and immigration--Case studies.