Columbia subject headings:
Nathan, Ernesto, 1845-1921--Congresses.
Rome (Italy)--Politics and government--1870-1945--Congresses.
Harvard subject headings:
Nathan, Ernesto, 1845-1921--Congresses.
Rome (Italy)--Politics and government--1870-1945--Congresses.
Princeton subject headings:
Nathan, Roberto, 1845-1921--Congresses.
Politicians--Italy--Rome--Congresses.
Rome (Italy)--Politics and government--1870-1945--Congresses.