Columbia subject headings:
Confidential communications--Great Britain.
Confidential communications--South Africa.
Confidential communications--United States.
Government information--Great Britain.
Government information--South Africa.
Government information--United States.
Harvard subject headings:
Government information--Great Britain
Government information--South Africa.
Government information--United States
Official secrets--Great Britain.
Official secrets--South Africa.
Official secrets--United States.
Princeton subject headings:
Government information--Great Britain.
Government information--South Africa.
Government information--United States.
Official secrets--Great Britain.
Official secrets--South Africa.
Official secrets--United States.