Columbia subject headings:
Geology--Europe.
Geology--Great Britain.
Geomorphology--Europe.
Geomorphology--Great Britain.
Harvard subject headings:
Geology--Europe
Geology--Great Britain
Geomorphology--Europe.
Geomorphology--Great Britain.
Princeton subject headings:
Geology--Europe.
Geology--Great Britain.
Geomorphology--Europe.
Geomorphology--Great Britain.