Columbia subject headings:
Czechoslovakia--Foreign relations--Poland--Sources.
Czechoslovakia--History--Intervention, 1968--Sources.
Europe, Eastern--Politics and government--1945-1989--Sources.
Poland--Foreign relations--1945-1989--Sources.
Poland--Foreign relations--Czechoslovakia--Sources.
Harvard subject headings:
Czechoslovakia--Foreign relations--Europe, Eastern--Sources.
Czechoslovakia--History--Intervention, 1968--Sources.
Europe, Eastern--Foreign relations--Czechoslovakia--Sources.
Europe, Eastern--Politics and government--1945-1989--Sources.
Princeton subject headings:
Czechoslovakia--Foreign relations--Poland--Sources.
Czechoslovakia--History--Intervention, 1968--Sources.
Europe, Eastern--Politics and government--1945-1989--Sources.
Poland--Foreign relations--1945-1989--Sources.
Poland--Foreign relations--Czechoslovakia--Sources.