Columbia subject headings:
Black Death--History--Congresses.
Harvard subject headings:
Communicable diseases--Congresses
Epidemics--Social aspects--Congresses.
Paleopathology--Congresses.
Plague--Congresses.
Plague--Social aspects--Congresses.
Princeton subject headings:
Communicable diseases--Congresses.
Epidemics--Social aspects--Congresses.
Paleopathology--Congresses.
Plague--Congresses.
Plague--Social aspects--Congresses.