Columbia subject headings:
Harvard subject headings:
Mainz (Rhineland-Palatinate, Germany)--Antiquities, Roman.
Navigation--Germany--Mainz (Rhineland-Palatinate)--History.
Navigation--Rome--History.
Romans--Germany--Mainz (Rhineland-Palatinate)
Shipbuilding--Germany--Mainz (Rhineland-Palatinate)
Shipbuilding--Rome--History.
Princeton subject headings:
Mainz (Rhineland-Palatinate, Germany)--Antiquities, Roman.
Navigation--Germany--Mainz (Rhineland-Palatinate).
Navigation--Rome--History.
Romans--Germany--Mainz (Rhineland-Palatinate).
Shipbuilding--Germany--Mainz (Rhineland-Palatinate).
Shipbuilding--Rome--History.