Columbia subject headings:
Davidsohn, Robert, 1853-1937.
Harvard subject headings:
Davidsohn, Robert, 1853-1937--Congresses.
Davidsohn, Robert, 1853-1937--Library--Congresses.
Florence (Italy)--Historiography--Congresses.
Historians--Italy--Florence--Congresses.
Historiography--Italy--Florence--Congresses.
Princeton subject headings:
Davidsohn, Robert, 1853-1937--Congresses.
Davidsohn, Robert, 1853-1937--Library--Congresses.
Florence (Italy)--Historiography--Congresses.
Historians--Italy--Florence--Congresses.
Historiography--Italy--Florence--Congresses.