Columbia subject headings:
Harvard subject headings:
Human geography--Mexico--Tlaxcala (State)
Land use--Mexico--Tlaxcala (State)
Latifundio--Mexico--Tlaxcala (State)
Mexico--Colonization.
Tlaxcala (Mexico : State)--Economic conditions.
Princeton subject headings:
Tlaxcala (Mexico : State)--History.
Tlaxcala (Mexico : State)--Social conditions.