Columbia subject headings:
America--Discovery and exploration--British.
America--Discovery and exploration--Spanish.
Cabot, John, -1498?
Columbus, Christopher.
Explorers--America--Biography.
Harvard subject headings:
America--Discovery and exploration--British.
America--Discovery and exploration--Spanish.
Cabot, John, -1498?
Columbus, Christopher
Explorers--America--Biography
Princeton subject headings:
America--Discovery and exploration--English.
America--Discovery and exploration--Spanish.
Cabot, John, -1498?
Columbus, Christopher.
Explorers--America--Biography.