Columbia subject headings:
Harvard subject headings:
Macerata (Italy : Province)--Civilization--Congresses.
Macerata (Italy : Province)--History--Congresses.
Marche (Italy)--Civilization--Congresses.
Marche (Italy)--History--Congresses.
Princeton subject headings:
Marche (Italy)--History--Congresses.
Marche (Italy)--History--Sources--Congresses.