Columbia subject headings:
Earth (Planet)--Crust--Congresses.
Metamorphism (Geology)--West (U.S.)--Congresses.
Harvard subject headings:
Earth (Planet)--Crust--Congresses.
Metamorphism (Geology)--West (U.S.)--Congresses.
Princeton subject headings:
Earth (Planet)--Crust--Congresses.
Metamorphism (Geology)--West (U.S.)--Congresses.