Columbia subject headings:
Obsidian--California.
Harvard subject headings:
California--Antiquities--Congresses.
Hydration rind dating--Congresses.
Indians of North America--California--Antiquities--Congresses.
Obsidian--California--Congresses.
Projectile points--California--Congresses.
Princeton subject headings:
Hydration rind dating--Congresses.
Obsidian--California--Congresses.