11. Kerlinger, P., and J. Brett. 1995. Hawk Mountain Sanctuary: a case study of birder visitation and birding economics at a private refuge. Pages 271-280 in Wildlife and recreationists: coexistence through management and research. Island Press, Washington, D. C. | Hawk Mountain Sanctuary: Learn Visit Join

11. Kerlinger, P., and J. Brett. 1995. Hawk Mountain Sanctuary: a case study of birder visitation and birding economics at a private refuge. Pages 271-280 in Wildlife and recreationists: coexistence through management and research. Island Press, Washington, D. C.

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