Companies: correspondence with R.L. Prain (Rhodesian Selection Trust, etc.), Harry F. Oppenheimer (Anglo-American Corporation of South Africa, etc.), and others concerning government taxation and financial policies towards (the copper) companies, dividend limitation, and the transfer of domicile from the United Kingdom to Northern Rhodesia (Zambia); copies of memoranda submitted to the United Kingdom Government by the copper companies, Sep 1951-Apr 1953