Columbia subject headings:
Atlases.
Canada--Population--Statistics--Periodicals.
Communication--United States--Maps.
Maps.
Transportation--United States--Maps.
United States--Economic conditions--Maps.
United States--Economic conditions--Statistics--Periodicals.
United States--Maps.
United States--Population--Maps.
United States--Population--Statistics--Periodicals.
Harvard subject headings:
Atlases
Canada--Population--Statistics--Periodicals.
Communication--United States--Maps.
Transportation--United States--Maps
United States--Economic conditions--Maps.
United States--Economic conditions--Statistics--Periodicals.
United States--Maps.
United States--Population--Maps.
United States--Population--Statistics--Periodicals.
Princeton subject headings: