Columbia subject headings:
Cities and towns--Canada--Maps--Bibliography.
Cities and towns--United States--Maps--Bibliography.
Library of Congress. Geography and Map Division.
Harvard subject headings:
Cities and towns--Canada--Maps--Bibliography.
Cities and towns--United States--Maps--Bibliography.
Library of Congress. Geography and Map Division.
Princeton subject headings:
Cities and towns--Canada--Maps--Bibliography.
Cities and towns--United States--Maps--Bibliography.
Library of Congress. Geography and Map Division