Columbia subject headings:
Geography, Ancient.
Nautical astronomy--History--To 1500.
Navigation--History--To 1500.
Harvard subject headings:
Geography, Ancient.
Nautical astronomy--History--To 1500.
Navigation--History--To 1500.
Princeton subject headings:
Geography, Ancient.
Nautical astronomy--History--To 1500.
Navigation--History--To 1500.