Columbia subject headings:
Revenue--Italy--Parma--History--To 1500--Sources.
Salt industry and trade--Taxation--Italy--Parma--History--To 1500--Sources.
Harvard subject headings:
Parma (Italy)--Census, 1415.
Parma (Italy)--History--Sources.
Revenue--Italy--Parma--History--To 1500--Sources.
Salt industry and trade--Taxation--Italy--Parma--History--To 1500--Sources.
Princeton subject headings:
Revenue--Italy--Parma--History--To 1500--Sources.
Salt industry and trade--Taxation--Italy--Parma--History--To 1500--Sources.