Columbia subject headings:
Harvard subject headings:
Elbląg (Poland)--History--Sources.
Harbors--Poland--Elbląg--Port charges--Sources.
Tolls--Poland--Elbląg--Sources.
Princeton subject headings:
Elbing (Germany)--History--Sources.
Harbors--Germany--Elbing--Port charges--Sources.
Tolls--Germany--Elbing--Sources.