Columbia subject headings:
Harvard subject headings:
Companhia Geral da Agricultura das Vinhas do Alto Douro--Archives--History.
Wine and wine making--Portugal--Douro--History--Sources.
Wine industry--Portugal--Douro--History--Sources.
Princeton subject headings:
Companhia Geral da Agricultura das Vinhas do Alto Douro--Archives--History.
Wine and wine making--Portugal--Douro--History--Sources.
Wine industry--Portugal--Douro--History--Sources.