Columbia subject headings:
Harvard subject headings:
Civilization, Celtic--Problems, exercises, etc.
Irish language--To 1100--Composition and exercises.
Irish language--To 1100--Grammar--Problems, exercises, etc.
Irish language--To 1100--Grammar.
Princeton subject headings:
Civilization, Celtic--Problems, exercises, etc.
Irish language--To 1100--Composition and exercises.
Irish language--To 1100--Grammar--Problems, exercises, etc.