Columbia subject headings:
Harvard subject headings:
Cartography--Germany--History--Congresses.
Cartography--History--Congresses
Cartography--Sweden--History--Congresses.
Demography--Congresses.
Germany--Population--Geographic information systems--Congresses.
Germany--Population--History--Congresses.
Germany--Population--Maps--Congresses.
Sweden--Population--Geographic information systems--Congresses.
Sweden--Population--History--Congresses.
Sweden--Population--Maps--Congresses.
Princeton subject headings:
Cartography--History--Congresses.
Demography--Congresses.