Columbia subject headings:
Cartography--Northwestern States--History--Maps.
Lewis and Clark Expedition (1804-1806)--Maps.
Lewis and Clark National Historic Trail--Maps.
Maps.
Harvard subject headings:
Cartography--Northwestern States--History--Maps.
Lewis and Clark Expedition (1804-1806)--Maps.
Lewis and Clark National Historic Trail--Maps.
Missouri River--Discovery and exploration--Maps.
Northwestern States--Discovery and exploration--Maps.
Princeton subject headings: