Columbia subject headings:
Mexico--History--Spanish colony, 1540-1810--Sources.
San Juan de Ulúa Island (Mexico)--History--Sources.
Harvard subject headings:
Drake, Francis, approximately 1540-1596
Drake, Francis, approximately 1540-1596--Travel--Mexico.
Hawkins, John, Sir, 1532-1595
Hawkins, John, Sir, 1532-1595--Travel--Mexico.
San Juan de Ulúa, Battle of, Mexico, 1568--Sources.
Princeton subject headings: