Columbia subject headings:
Mexico--Antiquities.
Toltecs.
Tula de Allende (Mexico)--Antiquities.
Harvard subject headings:
Mexico--Antiquities.
Toltecs.
Tula Site (Tula de Allende, Mexico)
Tula de Allende (Mexico)--Antiquities.
Princeton subject headings:
Toltecs.
Tula de Allende (Mexico)--Antiquities.
Tula de Allende (Mexico)--History.