Columbia subject headings:
Harbors--Atlantic Coast (Europe)--History--Congresses.
Harbors--Spain--Atlantic Coast--History--Congresses.
Harvard subject headings:
Atlantic Coast (Europe)--Economic conditions.
Commerce--Atlantic Coast (Europe)--History.
Harbors--Atlantic Coast (Europe)--History.
Harbors--Spain--History.
Princeton subject headings:
Harbors--Atlantic Coast (Europe)--History--Congresses.
Harbors--Spain--Atlantic Coast--History--Congresses.