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Gerhard Tschannerl and Kedar Bryan, editors
World Bank 1985 World Bank technical paper no. 48 , UNDP project management report no. 5
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edited by Gerhard Tschannerl
University of Dar es Salaam, Bureau of Resource Assessment and Land Use Planning [1971] Research paper / University College, Dar es Salaam, Bureau of Resource Assessment and Land Use Planning no. 20
Available at 2 libraries