Simpson, D.

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Simpson, D. 2009. San Diego Zoo: [Ficus for Sumatran rhino in Cincinnati]. International Zoo News 56 (3): 182-183.

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Simpson, D. 2009. San Diego Zoo’s Browse Program – helping animals with special dietary needs. Connect (AZA) April: 10-12, 3 images.

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Simpson, D. 1991. Prescription browse for rhinos. Zoonooz, San Diego 64 (5): 26.

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