Hydrological year-book. 

 - Lusaka. 
<br/><br/>Issued -1958/59, by the Ministry of Land and Natural Resources, Northern Rhodesia; 1959/60, by the Ministry of Lands and Natural Resources, Zambia; 1960/61- by the Ministry of Rural Development, Zambia. Prepared by the Hydrological Branch of the Water Affairs Dept.