Columbia subject headings:
Geology--Kentucky--Mammoth Cave.
Geology--Kentucky--Maps.
Geology--Kentucky.
Maps.
Physical geography--Kentucky.
Harvard subject headings:
Geology--Kentucky
Geology--Kentucky--Mammoth Cave.
Geology--Kentucky--Maps.
Physical geography--Kentucky.
Princeton subject headings:
Geology--Kentucky--Mammoth Cave.
Geology--Kentucky--Maps.
Geology--Kentucky.
Physical geography--Kentucky.