Columbia subject headings:
Early maps.
Geography, Medieval--Maps.
Geography--Maps--Early works to 1800.
Maps.
Harvard subject headings:
Cartography--History--Congresses
Early maps--Congresses.
Geography, Medieval--Congresses.
Historical geography--Maps--Congresses.
World maps--Early works to 1800--Congresses.
Princeton subject headings:
Early maps--Congresses.
Geography, Medieval--Maps--Congresses.
Geography--Early works to 1800--Maps--Congresses.