Columbia subject headings:
Great Britain--History, Naval--Tudors, 1485-1603.
Navigation--Great Britain--History--16th century.
Harvard subject headings:
Great Britain--History, Naval--Tudors, 1485-1603
Navigation--Great Britain--History--16th century.
Princeton subject headings:
Great Britain--History, Naval--Tudors, 1485-1603.
Navigation--Great Britain--History--16th century.