Columbia subject headings:
Food supply--Italy--Rome--History.
Grain trade--Italy--Rome--History.
Rome (Italy)--Economic conditions.
Rome (Italy)--History--1420-1798.
Harvard subject headings:
Food supply--Italy--Rome--History.
Grain trade--Italy--Rome--History.
Rome (Italy)--Economic conditions.
Rome (Italy)--History--1420-1798.
Princeton subject headings:
Food prices--Italy--Papal States--History.
Food supply--Italy--Papal States--History.
Grain--Prices--Italy--History.
Papal States--Economic conditions.
Rome (Italy)--Economic conditions.