Columbia subject headings:
Colonies--Economic policy--Congresses.
Europe--Colonies--History--Congresses.
Europe--Commerce--History--Congresses.
Harbors--Economic aspects--Congresses.
Imperialism--Economic aspects--Congresses.
Harvard subject headings:
Colonies--Economic policy--Congresses.
Europe--Colonies--History--Congresses.
Europe--Commerce--History--Congresses.
Harbors--Economic aspects--Congresses.
Imperialism--Economic aspects--Congresses.
Princeton subject headings:
Colonies--Economic policy--Congresses.
Europe--Colonies--History--Congresses.
Europe--Commerce--History--Congresses.
Harbors--Economic aspects--Congresses.
Imperialism--Economic aspects--Congresses.