Columbia subject headings:
Harvard subject headings:
Magic--Italy--Siena--History--Congresses.
Occultism--Italy--Siena--History--Congresses.
Siena (Italy)--Social life and customs--Congresses.
Princeton subject headings:
Hermetism--Italy--Siena--History--To 1500--Congresses.
Magic--Italy--Siena--History--To 1500--Congresses.