Columbia subject headings:
Community development--Mexico--Tlaxcala (State)
Tlaxcala (Mexico : State)--Economic conditions.
Tlaxcala (Mexico : State)--Population.
Harvard subject headings:
Community development--Mexico--Tlaxcala (State)
Tlaxcala (Mexico : State)--Economic conditions.
Tlaxcala (Mexico : State)--Population.
Princeton subject headings: