Columbia subject headings:
Harvard subject headings:
Cantiere navale di Ancona--History.
Shipbuilding industry--Employees--Labor unions--Italy--Ancona--History.
Shipbuilding industry--Italy--Ancona--Employees--History.
Shipbuilding industry--Italy--Ancona--History.
Princeton subject headings:
Navy-yards and naval stations--Italy--Ancona--History.
Shipbuilding industry--Italy--Ancona--Employees--History.
Shipyards--Italy--Ancona--History.