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[267] Cordell, H. K., B. McDonald, R. J. Teasley, J. C. Bergstrom, J. Martin, J. Bason, and V. R. Leeworthy. "Outdoor Recreation Participation Trends." In Outdoor Recreation in American Life: A National Assessment of Demand and Supply Trends, edited by H. K. Cordell and S. M. McKinney, 219-321. Champaign, IL: Sagamore Publishing, 1999.