Columbia subject headings:
Geology--Kentucky--Butler County--Maps.
Geology--Kentucky--Muhlenberg County--Maps.
Geology--Kentucky--Ohio County--Maps.
Maps.
Harvard subject headings:
Butler County (Ky.)--Maps.
Geology--Kentucky--Maps.
Kentucky--Maps.
Muhlenberg County (Ky.)--Maps.
Ohio County (Ky.)--Maps.
Princeton subject headings: