Columbia subject headings:
Cities and towns--North America--Maps.
Maps.
North America--Economic conditions--Maps.
North America--Maps.
North America--Photographs from space.
Physical geography--North America--Maps.
Harvard subject headings:
Cities and towns--North America--Maps.
Economic geography--Maps.
North America--Maps
North America--Photographs from space.
Physical geography--North America--Maps.
Princeton subject headings: