Columbia subject headings:
Harvard subject headings:
Elbląg (Poland)--Commerce--History--Congresses.
Elbląg (Poland)--Economic conditions--Congresses.
Gdańsk (Poland)--Commerce--History--Congresses.
Gdańsk (Poland)--Economic conditions--Congresses.
Princeton subject headings:
Elbing (Poland)--Economic conditions--History--Congresses.
Elbing (Poland)--Economic policy--History--Congresses.
Gdańsk (Poland)--Economic conditions--History--Congresses.
Gdańsk (Poland)--Economic policy--History--Congresses.
Groth, Andrzej--writer of added commentary.