Columbia subject headings:
Harvard subject headings:
Agriculture--Mexico--Laguna Region--History.
Irrigation canals and flumes--Mexico--Laguna Region.
Irrigation--Mexico--Laguna Region--History.
Laguna Region (Mexico)--Economic conditions.
Princeton subject headings:
Agriculture--Mexico--Laguna Region--History.
Irrigation canals and flumes--Mexico--Laguna Region.
Irrigation--Mexico--Laguna Region--History.
Laguna Region (Mexico)--Economic conditions.