Columbia subject headings:
Education--Mexico--Sonora (State)
Harvard subject headings:
Education--Political aspects--Mexico--Sonora (State)--History--20th century.
Educational change--Mexico--Sonora (State)--History--20th century.
Princeton subject headings:
Education--Political aspects--Mexico--Sonora (State)--History--20th century.
Educational change--Mexico--Sonora (State)--History--20th century.