Columbia subject headings:
Yucatán (Mexico : State)--Commerce--History.
Yucatán (Mexico : State)--Economic conditions.
Yucatán (Mexico : State)--Politics and government.
Harvard subject headings:
Yucatán (Mexico : State)--Commerce--History.
Yucatán (Mexico : State)--Economic conditions.
Yucatán (Mexico : State)--Politics and government.
Princeton subject headings:
Yucatán (Mexico : State)--Commerce--History.
Yucatán (Mexico : State)--Economic conditions.
Yucatán (Mexico : State)--Politics and government.