Columbia subject headings:
Obsidian--Wyoming.
Petrology in archaeology--Wyoming.
Harvard subject headings:
Indians of North America--Implements--Wyoming.
Indians of North America--Wyoming--Antiquities.
Obsidian--Yellowstone National Park.
Petrology in archaeology--Yellowstone National Park.
Stone implements--Yellowstone National Park.
Yellowstone National Park--Antiquities.
Princeton subject headings:
Indians of North America--Implements--Wyoming.
Indians of North America--Wyoming--Antiquities.
Obsidian implements--Yellowstone National Park.
Obsidian--Yellowstone National Park.
Petrology in archaeology--Yellowstone National Park.
Yellowstone National Park--Antiquities.