Northern Rhodesia. Dept. of Geological Survey. Economic Unit & Zambia. Geological Survey Dept. Economic Unit. (1963). Economic Unit report. Ministry of Labour and Mines, Geological Survey Dept., Economic Unit, Northern Rhodesia Govt..

Northern Rhodesia. Dept. of Geological Survey. Economic Unit and Zambia. Geological Survey Dept. Economic Unit. Economic Unit Report. [Lusaka]: Ministry of Labour and Mines, Geological Survey Dept., Economic Unit, Northern Rhodesia Govt., 1963.

Northern Rhodesia. Dept. of Geological Survey. Economic Unit and Zambia. Geological Survey Dept. Economic Unit. Economic Unit Report. Ministry of Labour and Mines, Geological Survey Dept., Economic Unit, Northern Rhodesia Govt., 1963.