Columbia subject headings:
Explorers--Northwest, Pacific--History.
Explorers--Spain--History.
Northwest, Pacific--Discovery and exploration--Spanish.
Spain--Discovery and exploration.
Harvard subject headings:
Discoveries in geography--Spain.
Explorers--Northwest, Pacific--History.
Explorers--Spain--History.
Northwest, Pacific--Discovery and exploration--Spanish.
Princeton subject headings:
Northwest, Pacific--Discovery and exploration, Spanish.
Spain--Exploring expeditions.