Nyasaland (Malawi) security: correspondence with the Governor of Nyasaland (Malawi), the Secretaries of State, and the Prime Minister of the United Kingdom concerning policing and the reinforcement of the police in Nyasaland (Malawi), the possible use of United Kingdom troops there; security and intelligence reports; and record of discussions between the Federal Prime Minister and United Kingdom ministers (London, 9-13 May), Jan-Dec 1960; Aug 1961