Columbia subject headings:
Heróico Colegio Militar (Mexico)--History.
Popotla (Mexico City)--History.
Harvard subject headings:
Heróico Colegio Militar (Mexico)--History--20th century.
Mexico City (Mexico)--Buildings, structures, etc.
Mexico City (Mexico)--History
Popotla (Mexico City, Mexico)--Buildings, structures, etc.
Popotla (Mexico City, Mexico)--History.
Princeton subject headings: