Columbia subject headings:
Alfonso IV, King of Aragon, 1299-1336.
Barcelona (Spain)--Economic conditions.
Barcelona (Spain)--Occupations--History.
Public works--Spain--Barcelona--History.
Wheat trade--Spain--Barcelona--History.
Harvard subject headings:
Alfonso IV, King of Aragon, 1299-1336.
Barcelona (Spain)--Economic conditions.
Barcelona (Spain)--History.
Occupations--Spain--Barcelona--History.
Public works--Spain--Barcelona--History.
Wheat trade--Spain--Barcelona--History.
Princeton subject headings:
Alfonso IV, King of Aragon, 1299-1336.
Barcelona (Spain)--Economic conditions.
Occupations--Spain--Barcelona--History.
Public works--Spain--Barcelona--History.
Wheat trade--Spain--Barcelona--History.