1) http://www.y2y.net
2) U.S. Fish and Wildlife Service, "Grizzly Bear: 5-Year Review", August 2011,pdf.
3) U.S. Fish and Wildlife Service, "Grizzly Bear", March 2007, pdf.
4) Merrill, Troy, "Grizzly Bear Conservation in the Yellowstone to Yukon Region: Technical Report 6", August 2005, pdf.
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