Columbia subject headings:
Harvard subject headings:
Michoacán de Ocampo (Mexico)--Population--Congresses.
Rural-urban migration--Mexico--Michoacán de Ocampo--Congresses.
Princeton subject headings:
Michoacán de Ocampo (Mexico)--Emigration and immigration--History--Congresses.
Migration, Internal--Mexico--Michoacán de Ocampo--History--Congresses.