Columbia subject headings:
Harvard subject headings:
Civilization, Medieval--Congresses
Cosmology, Medieval--Congresses.
Space and time--History--Congresses.
Space in literature--Congresses.
Space perception--History--Congresses.
Princeton subject headings:
Civilization, Medieval--Congresses.
Space and time--History--Congresses.
Space in literature--Congresses.
Space perception--History--Congresses.