Columbia subject headings:
Harvard subject headings:
Water reuse--Mexico--Tlaxcala (State)--History.
Wetland agriculture--Mexico--Tlaxcala (State)--History.
Princeton subject headings:
Agriculture--Mexico--Tlaxcala (State)--History.
Water reuse--Mexico--Tlaxcala (State)--History.
Wetlands--Mexico--Tlaxcala (State)--History.