Columbia subject headings:
America--Discovery and exploration--Pre-Columbian.
Inscriptions, Irish--United States.
United States--Antiquities.
Harvard subject headings:
America--Discovery and exploration--Pre-Columbian.
Inscriptions, Celtic--United States.
Inscriptions, Irish--United States.
Inscriptions, Irish.
United States--Antiquities.
Princeton subject headings:
America--Discovery and exploration--Pre-Columbian.
Inscriptions, Irish.