Columbia subject headings:
Harvard subject headings:
Assassination--Italy--Sicily.
Mafia--Italy--Sicily
Notarbartolo, Emanuele, 1834-1893.
Sicily (Italy)--Politics and government--1870-1945
Princeton subject headings:
Mafia--Italy--Sicily--History--19th century.
Murder--Italy--Palermo--History--19th century.
Notarbartolo, Emmanuele, 1834-1893--Assassination.