Columbia subject headings:
Europe, Central--Antiquities, Roman--Congresses.
Romans--Europe, Central--Congresses.
Harvard subject headings:
Danube River Valley--Antiquities, Roman--Congresses.
Europe, Central--Antiquities, Roman--Congresses.
Excavations (Archaeology)--Danube River Valley--Congresses.
Excavations (Archaeology)--Rhine River Valley--Congresses.
Military architecture--Danube River Valley--History--Congresses.
Military architecture--Rhine River Valley--History--Congresses.
Military camps--Danube River Valley--History--Congresses.
Military camps--Rhine River Valley--History--Congresses.
Rhine River Valley--Antiquities, Roman--Congresses.
Romans--Europe, Central--Congresses.
Princeton subject headings:
Danube River Valley--Antiquities, Roman--Congresses.
Excavations (Archaeology)--Danube River Valley--Congresses.
Excavations (Archaeology)--Rhine River Valley--Congresses.
Military architecture--Danube River Valley--History--Congresses.
Military architecture--Rhine River Valley--History--Congresses.
Military camps--Danube River Valley--History--Congresses.
Military camps--Rhine River Valley--History--Congresses.
Rhine River Valley--Antiquities, Roman--Congresses.