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Congress of the Union of the Working Class, Warsaw. Used.
Congress of the People's Movement for Unity. Used.
25th death anniversary of Julian Marchlewski. Used.
Day of International Action for World Peace. Used.
25th anniversary of the execution of three Polish revolutionists. Used.
1st Polish Peace Congress, Warsaw. Used.
Boleslaw Bierut. Used.
Poland's 6-year plan. Used.
Congress of Women. Used.
80th anniversry of the Insurrection of Paris. Used.
Surcharged on stamp 531. Used.
Labor Day. Used.
Polish Eagle. Issued without gum*