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Economics of controlling trade in endangered species : the African elephant
Burgess, Joanne C., (1989)
Values of the African elephant in relation to conservation and exploitation
Vredin, Maria, (1995)
Elephants and ivory : lessons from the trade ban
Sugg, Ike C., (1994)
The economic returns to wildlife management in Southern Africa
Barnes, Jon I., (2000)
The value of non-agricultural land use in some Namibian communal areas : a data base for planning
Barnes, Jon I., (1995)
Cattle numbers, biomass, productivity, and land degradation in the commercial farming sector of Namibia, 1915 to 1995
Lange, Glenn-Marie, (1997)