Columbia subject headings:
Puebla de Zaragoza (Mexico)--Economic conditions--Congresses.
Puebla de Zaragoza (Mexico)--History--Congresses.
Harvard subject headings:
Puebla (Mexico : State)--Economic conditions--Congresses.
Puebla (Mexico : State)--History--Congresses.
Princeton subject headings:
Puebla (Mexico : State)--Economic conditions.
Puebla (Mexico : State)--History.
Puebla (Mexico : State)--Social conditions.