Columbia subject headings:
Harvard subject headings:
Poland--Politics and government--1945-1980
Poland--Politics and government--1980-1989
Poland--Relations--United States.
Subversive activities--Poland.
United States--Relations--Poland.
Princeton subject headings:
Poland--Politics and government--1945-1980.
Poland--Politics and government--1980-1989.
Poland--Relations--United States.
Subversive activities--Poland.
United States--Relations--Poland.