Roger A. Powell

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Carnivore ecology and conservationLuigi Boitani, Roger A. Powell
Carnivore ecology and conservation
Luigi Boitani, Roger A. Powell · 2012 · 506 pages
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The fisherRoger A. Powell
The fisher
Roger A. Powell · 1982 · 227 pages
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Ecology and behaviour of North American black bearsRoger A. Powell, R.A. Powell et al.
Ecology and behaviour of North American black bears
Roger A. Powell, R.A. Powell, J.W. Zimmerman · 1997 · 224 pages
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