Columbia subject headings:
Harvard subject headings:
Geology, Structural--Guidebooks.
Geology--Middle West--Guidebooks.
Geology--Northeastern States--Guidebooks.
Metamorphism (Geology)--Middle West--Guidebooks.
Metamorphism (Geology)--Northeastern States--Guidebooks.
Northeastern States--Guidebooks.
Princeton subject headings:
Geology, Structural--Guidebooks.
Geology--Middle West--Guidebooks.
Geology--Northeastern States--Guidebooks.
Metamorphism (Geology)--Middle West--Guidebooks.
Metamorphism (Geology)--Northeastern States--Guidebooks.
Northeastern States--Guidebooks.