Columbia subject headings:
Historians--Mexico--Mexico City--Congresses.
Mexico City (Mexico)--History--Sources--Congresses.
Harvard subject headings:
Historians--Mexico--Mexico City--Congresses.
Mexico City (Mexico)--History--Sources--Congresses.
Princeton subject headings:
Historians--Mexico--Mexico City v Congresses.
Mexico City (Mexico)--History--Sources--Congresses.