| Varisco, D.M., 1989. Beyond rhino horn - wildlife conservation for North Yemen. Oryx 23 (4): 215-219
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| Varisco, D.M., 1989. From rhino horns to dagger handles - a deadly business. Animal Kingdom 92 (3): 44-49, figs. 1-5
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| Varisco, D.M., 1989. From rhino horns to dagger handles - a deadly business. Animal Kingdom 92 (3): 44-49, figs. 1-5
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