Columbia subject headings:
America--Antiquities--Congresses.
Archaeoastronomy--Congresses.
Indian astronomy--Congresses.
Indians--Antiquities--Congresses.
Maya astronomy--Congresses.
Mayas--Antiquities--Congresses.
Harvard subject headings:
America--Antiquities--Congresses.
Archaeoastronomy--America--Congresses.
Archaeoastronomy--Congresses.
Indian astronomy--Congresses.
Indians--Antiquities--Congresses
Maya astronomy--Congresses.
Mayas--Antiquities--Congresses
Princeton subject headings:
Archaeoastronomy--America--Congresses.
Indian astronomy--Congresses.