| Hren, R., 2008. Rhinos, elephants and bears. The Crash August 2008: 5, figs. 1-3
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| Hren, R., 2007. Facility focus - Milwaukee County Zoo. The Crash 2 (1): 2-4, figs. 1-10
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| Hren, R., 2006. "Kalahari' the female Black rhino arrives at the Milwaukee Zoo . Alive (Zoological Society of Milwaukee County) 26 (1) Winter: 30, 1 image
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