Columbia subject headings:
Harvard subject headings:
Civilization, Classical--Congresses
Civilization, Greco-Roman--Congresses
Classical antiquities--Congresses.
Human geography--Congresses
Human settlements--Congresses.
Mediterranean Region--Civilization--Congresses.
Space archaeology--Congresses.
Space environment--Congresses.
Space--Congresses.
Princeton subject headings:
Civilization, Classical--Congresses.
Civilization, Greco-Roman--Congresses.
Classical antiquities--Congresses.
Human geography--Congresses.
Human settlements--Congresses.
Mediterranean Region--Civilization--Congresses.
Space archaeology--Congresses.
Space environment--Congresses.
Space--Congresses.