Columbia subject headings:
Harvard subject headings:
El Bajío Region (Guanajuato, Mexico)--Economic conditions.
El Bajío Region (Guanajuato, Mexico)--Social conditions.
Irrigation--Mexico--El Bajío Region (Guanajuato)--History.
Princeton subject headings:
Irrigation--Economic aspects--Mexico--El Bajío (Guanajuato).
Irrigation--Mexico--El Bajío Region (Guanajuato)--History.
Irrigation--Social aspects--Mexico--El Bajío (Guanajuato).