Columbia subject headings:
Geology--Ireland.
Geology--Northern Ireland.
Ireland--Historical geography.
Landforms--Ireland.
Landforms--Northern Ireland.
Landscapes--Ireland.
Landscapes--Northern Ireland.
Northern Ireland--Historical geography.
Physical geography--Ireland.
Physical geography--Northern Ireland.
Harvard subject headings:
Ireland--Historical geography.
Landforms--Ireland.
Landforms--Northern Ireland.
Landscapes--Ireland.
Landscapes--Northern Ireland.
Northern Ireland--Historical geography.
Princeton subject headings: