Columbia subject headings:
Harvard subject headings:
Phthiōtis (Greece)--Antiquities--Congresses.
Phthiōtis (Greece)--Civilization--Congresses.
Phthiōtis (Greece)--History--Congresses.
Princeton subject headings:
Phthiōtis (Greece)--Antiquities--Congresses.
Phthiōtis (Greece)--Civilization--Congresses.
Phthiōtis (Greece)--History--Congresses.