Columbia subject headings:
Harvard subject headings:
Czechoslovakia--History--Intervention, 1968.
Czechoslovakia--Military relations--Germany (East)
Germany (East)--Military relations--Czechoslovakia.
Germany (East)--Politics and government.
Germany (East). Nationale Volksarmee
Princeton subject headings:
Czechoslovakia--History--Intervention, 1968.
Czechoslovakia--Military relations--Germany (East).
Germany (East)--Military relations--Czechoslovakia.
Germany (East)--Politics and government.
Germany (East). Nationale Volksarmee