Columbia subject headings:
Excavations (Archaeology)--History--Congresses.
Excavations (Archaeology)--Philosophy--Congresses.
Historic preservation--History--Congresses.
Historic preservation--Philosophy--Congresses.
Harvard subject headings:
Archaeology--History--Congresses.
Excavations (Archaeology)--Congresses
Historic preservation--Congresses
Historic preservation--History--Congresses.
Princeton subject headings:
Excavations (Archaeology)--History--Congresses.
Excavations (Archaeology)--Philosophy--Congresses.
Historic preservation--History--Congresses.
Historic preservation--Philosophy--Congresses.