Columbia subject headings:
Harvard subject headings:
Canary Islands--Economic conditions--Congresses.
Sugar trade--Atlantic Ocean Region--History--Congresses.
Sugar trade--Canary Islands--History--Congresses.
Sugarcane--Canary Islands--History--Congresses.
Princeton subject headings:
Sugar trade--Canary Islands--History--Congresses.
Sugar trade--Latin America--History--Congresses.