Columbia subject headings:
Culture.
Mayas--Mexico--Antiquities.
Mayas--Origin.
Olmecs--Mexico--Antiquities.
Olmecs--Origin.
Harvard subject headings:
Culture
Mayas--Mexico--Antiquities.
Mayas--Origin--History.
Olmecs--Mexico--Antiquities.
Olmecs--Origin--History.
Princeton subject headings:
Mayas--History--Sources.
Mayas--Mexico--Antiquities.
Mayas--Origin.
Olmecs--Antiquities.
Olmecs--History.
Olmecs--Origin.