 | Leader Williams, N.; Albon, S.D.; Berry, P.S.M., 1990. Illegal exploitation of black rhinoceros and elephant populations: patterns of decline, law enforcement and patrol effort in Luangwa Valley, Zambia. Journal of Applied Ecology 27 (3): 1055-1087, figs. 1-19, tables 1-4
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| Berry, P.S.M., 1983. Zambia enacts stricter legislation for ivory and rhino poaching. Newsletter of the African Elephant and Rhino Group 2: 20
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