Columbia subject headings:
Harvard subject headings:
Flintknapping--Mexico.
Indians of Mexico--Antiquities
Mexico--Antiquities.
Obsidian implements--Mexico.
Paleo-Indians--Implements--Mexico.
Stone implements--Mexico.
Princeton subject headings:
Flintknapping--Mexico.
Indians of Mexico--Implements.
Mexico--Antiquities.
Obsidian implements--Mexico.