Columbia subject headings:
Poland--Politics and government--1945-1980.
Strikes and lockouts--Poland--Gdańsk.
Harvard subject headings:
Gdańsk (Poland)--History--20th century.
Poland--Politics and government--1945-1980
Strikes and lockouts--Poland--Gdańsk--History.
Princeton subject headings:
Gdańsk (Poland)--History--20th century.
Grudzień 1970--History.
Poland--Politics and government--1945-1980.
Strikes and lockouts--Poland--Gdańsk--History.